A few tips...
Be sure to develop ALL your pieces as rapidly as you can in the opening - this is extremely important - you are already behind if you have fewer developed pieces than your opponent.
Development includes connecting your rooks on the first rank (i.e., this means that your other pieces are no longer occupying the first rank, and that you have castled). And if files become open (clear of all pawns) or semi-open (i.e., only your opponent's pawns are on the file), or likely to become so, it is generally a good idea to post your rooks such that they have influence on, and command of, these files.
So once you have developed ALL your pieces, begin to think of ways that you can open lines (files and diagonals) as required - consistent with your offensive plan - for your rooks, bishops and Queen. The point is to give your pieces more potential for "activity" and for them to be able to influence more squares on the board (called "scope"). All other things being equal, the player with the greater activity and scope for his pieces generally enjoys an advantage. Other than a material advantage, this is probably the single most important advantage to strive for in a game.
For opening files, this is accomplished generally via pawn exchanges (a file is not open for you if your pawn(s) is on it). These pieces also require open lines so that when the time is right they can quickly participate in an attack. The greater the number of pieces you can bring to bear in an attack, the more likely it is to succeed. Insufficient attacking force in many cases will not only end up needlessly wasting valuable pieces, but also increases the likelihood that your opponent will be able to fend off your attack, turn the tables, and gain the initiative..
On each move, FIRST try to identify immediate threats to you (are ALL your pieces protected?!). Once you have developed your pieces, begin the (continuous, on every move) process of identifying if there are any useful threats you can create for your opponent to deal with - that is, try to create problems for your opponent to solve as much as possible - if you don't, you're just giving him free reign to do whatever he likes. Better to put him in the position of having to deal with your moves and threats, as opposed to the other way round. At the same time, be cognizant of improving the position/placement of your pieces and pawns, not only for ensuring an adequate defense, but equally important to put them in a position where they can support and/or quickly participate in an attack/tactic/combination - i.e., offensive operations.
The following very instructive video makes the point (revealed at minute 15:10) that "activity is the underlying principle which governs all chess games"....
Chess opening principles for beginners…
https://www.youtube.com/watch?v=9ugDFOoevyI
When deciding upon a move, think in terms of….
The Principle of Maximum Usefulness…
https://www.mark-weeks.com/aboutcom/aa06b18.htm
Spend some time studying the following instructive game with the goal of understanding the reasoning (i.e., the principles) behind each and every move White makes…go over the game (slowly) as many times as it takes until you understand White’s decisions…
5 most important principles of attack in chess…
https://www.youtube.com/watch?v=vPlzkrBzlko
From your profile you play exclusively rapid and blitz games. Try to play mostly longer time controls, including "daily" chess, so you have time to think about what you should be doing - speed chess may be fun, but at this stage of your development it will do little to promote your rapid improvement or your understanding of how to play correctly.
It makes sense that taking time to think about what you should be doing would promote improvement in your chess skills.
This is not to suggest that you should necessarily play exclusively slow time controls or daily games, but they should be the greater percentage of your games, much more so than speed games (rapid, bullet, blitz, etc.) which do almost nothing to promote an understanding of how to play the game well. Speed chess tends to be primarily an exercise in moving pieces around faster than your opponent while avoiding checkmate, in hopes that his/her clock runs out sooner than yours.
Here's what IM Jeremy Silman has to say on the topic...
https://www.chess.com/article/view/longer-time-controls-are-more-instructive
And the experience of a FIDE Master...
https://www.chess.com/forum/view/general/how-blitz-and-bullet-rotted-my-brain-don-t-let-it-rot-yours
Also, playing without a good foundation in fundamental chess principles and understanding how to apply them will do little to help you become a good chess player. In order to understand these principles it takes study - there is no easy, quick solution to playing good chess....you have to put in the effort to learn...
Good Chess Books for Beginners and Beyond....
https://www.chess.com/blog/RussBell/good-chess-books-for-beginners-and-beyond
I started to seriously study chess about 2,5 weeks ago, which I started with the lessons on this website, some YouTube videos and the tactic puzzles.
After about a week I thought to myself that learning from playing would obviously be a good idea as well, but I was instantly pummeled to 500-600 rank. Although I have been gotten slightly better, I feel like I am unable to make progress when it comes to tactics and playing chess in general.
What do you think is best way to study chess for beginners?