How can I improve my chess game?

You need to follow basic opening principles. In your first game, you moved the same piece for the first 2 moves; that's a major mistake. Generally the same piece is not moved more than once in the opening unless you have to. In your second game you moved your pawns each of the first 4 moves. Wrong approach. Stick a pawn or two in the center, then start developing your pieces. Your third game you developed a rook pawn instead of fighting for the center and again moved the same piece twice. The fourth game you voluntarily walled off your light squared bishop with d3. If black allows you to play e4 and d4, you should. Again in the fifth game you move a rook pawn instead of fighting for the center with e4 or d4. Still, not bad for a week's experience. You do need to study some general opening principles though before your mistakes become ingrained habits. Good Luck!

Here's an article with various master's rules for the opening. I know, it looks long and boring, but read it anyway and notice how they mostly all say the same things. Again, good luck..,
https://www.chess.com/forum/view/chess-openings/general-rules
"... for those that want to be as good as they can be, they'll have to work hard.
Play opponents who are better than you … Learn basic endgames. Create a simple opening repertoire (understanding the moves are far more important than memorizing them). Study tactics. And pick up tons of patterns. That’s the drumbeat of success. ..." - IM Jeremy Silman (December 27, 2018)
https://www.chess.com/article/view/little-things-that-help-your-game
https://www.chess.com/article/view/how-to-start-out-in-chess
https://www.chess.com/blog/michechess89/8-tips-to-increase-your-online-rating
https://www.chess.com/news/view/rapid-chess-improvement
https://www.chess.com/news/view/a-new-years-resolution-improve-your-chess-with-new-lessons
https://www.chess.com/article/view/mastery-chess-lessons-are-here
"... In order to maximize the benefits of [theory and practice], these two should be approached in a balanced manner. ... Play as many slow games (60 5 or preferably slower) as possible, ... The other side of improvement is theory. ... This can be reading books, taking lessons, watching videos, doing problems on software, etc. ..." - NM Dan Heisman (2002)
https://web.archive.org/web/20140627084053/http://www.chesscafe.com/text/heisman19.pdf
"... If it’s instruction, you look for an author that addresses players at your level (buying something that’s too advanced won’t help you at all). This means that a classic book that is revered by many people might not be useful for you. ..." - IM Jeremy Silman (2015)
https://www.chess.com/article/view/the-best-chess-books-ever
Here are some reading possibilities that I often mention:
Simple Attacking Plans by Fred Wilson (2012)
https://web.archive.org/web/20140708090402/http://www.chesscafe.com/text/review874.pdf
http://dev.jeremysilman.com/shop/pc/Simple-Attacking-Plans-77p3731.htm
Logical Chess: Move by Move by Irving Chernev (1957)
https://web.archive.org/web/20140708104437/http://www.chesscafe.com/text/logichess.pdf
The Most Instructive Games of Chess Ever Played by Irving Chernev (1965)
https://chessbookreviews.wordpress.com/tag/most-instructive-games-of-chess-ever-played/
Winning Chess by Irving Chernev and Fred Reinfeld (1948)
https://web.archive.org/web/20140708093415/http://www.chesscafe.com/text/review919.pdf
Back to Basics: Tactics by Dan Heisman (2007)
https://web.archive.org/web/20140708233537/http://www.chesscafe.com/text/review585.pdf
https://www.chess.com/article/view/book-review-back-to-basics-tactics
https://static1.squarespace.com/static/5856bd64ff7c50433c3803db/t/5895fc0ca5790af7895297e4/1486224396755/btbtactics2excerpt.pdf
Discovering Chess Openings by GM John Emms (2006)
https://web.archive.org/web/20140627114655/http://www.chesscafe.com/text/hansen91.pdf
Openings for Amateurs by Pete Tamburro (2014)
http://kenilworthian.blogspot.com/2014/05/review-of-pete-tamburros-openings-for.html
https://chessbookreviews.wordpress.com/tag/openings-for-amateurs/
https://www.chess.com/blog/ForwardChess/book-of-the-week-openings-for-amateurs
https://www.mongoosepress.com/catalog/excerpts/openings_amateurs.pdf
Chess Endgames for Kids by Karsten Müller (2015)
https://chessbookreviews.wordpress.com/tag/chess-endgames-for-kids/
http://www.gambitbooks.com/pdfs/Chess_Endgames_for_Kids.pdf
A Guide to Chess Improvement by Dan Heisman (2010)
https://web.archive.org/web/20140708105628/http://www.chesscafe.com/text/review781.pdf
Studying Chess Made Easy by Andrew Soltis (2009)
https://web.archive.org/web/20140708090448/http://www.chesscafe.com/text/review750.pdf
Seirawan stuff:
http://seagaard.dk/review/eng/bo_beginner/ev_winning_chess.asp?KATID=BO&ID=BO-Beginner
https://web.archive.org/web/20140708090229/http://www.chesscafe.com/text/review492.pdf
http://www.nystar.com/tamarkin/review1.htm
https://web.archive.org/web/20140627132508/http://www.chesscafe.com/text/hansen173.pdf
https://www.chess.com/article/view/book-review-winning-chess-openings
https://www.chess.com/article/view/book-review-winning-chess-endings
https://web.archive.org/web/20140708092617/http://www.chesscafe.com/text/review560.pdf

You're into chess for only a week. Get real.
Spelenderwijs wrote: You're into chess for only a week. Get real.
I do not see anything unreal about "trying to get better."

I do not see anything unreal about "trying to get better."
Ignore @Spelenderwijs. If you have been playing for a week and play good games with a computer rated 500, that's awesome! I've been playing for 4-5 years and I'm only rated 1200 or so! Just understand that it will take you a while to get better.
The Chess.com lessons are perfect for now, but once you get to 'round 11-1200 ELO, you'll want to get a chess book. I recommend How to Reassess Your Chess by Jeremy Silman.

Improving Your Chess - Resources for Beginners and Beyond...
https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond
https://www.chess.com/blog/RussBell

I do not see anything unreal about "trying to get better."
Ignore @Spelenderwijs. If you have been playing for a week and play good games with a computer rated 500, that's awesome! I've been playing for 4-5 years and I'm only rated 1200 or so! Just understand that it will take you a while to get better.
The Chess.com lessons are perfect for now, but once you get to 'round 11-1200 ELO, you'll want to get a chess book. I recommend How to Reassess Your Chess by Jeremy Silman.
Sorry I quoted the wrong person! I was talking to @cawds149.

I do not see anything unreal about "trying to get better."
And i see everything unreal in trying to beat a computer at chess, even if it's only rated 500, after getting into chess for only a week

Just understand that it will take you a while to get better.
Or you can just tell him to get real.
But ignore me all you want

Just understand that it will take you a while to get better.
Or you can just tell him to get real.
But ignore me all you want
What is your point? That if one runs into troubles while trying to get better, that that person must give it up?
He was just trying to give us an idea of his progress. I, for one, think it's great that he's already trying to play the computer rated 500.

Just understand that it will take you a while to get better.
Or you can just tell him to get real.
But ignore me all you want
What is your point? That if one runs into troubles while trying to get better, that that person must give it up?
No, i'm telling him the same thing as you are. Only a little harsher.

Just understand that it will take you a while to get better.
Or you can just tell him to get real.
But ignore me all you want
What is your point? That if one runs into troubles while trying to get better, that that person must give it up?
No, i'm telling him the same thing as you are. Only a little harsher.
Why do you need to be harsh?

Why not?
That is not a valid answer.
Because i feel like it?

I'm working through the Lessons here on Chess.com. There's a lot of gold there for us new players. They start off very simply with the basics. Turns out there's some very basic things I did not know! Also, play real games, against real people. After you finish a game, let the site analyze it and then work through the game slowly. Chess.com will show you where you made mistakes and what the better choices would have been.