new to online chess

someone told me that this was a good place for tips, help please?

that was a long time ago lmao

you can browse the pinned forums here if you wish, or you could go to DoP (a more active version of this) and do the same thing there

There are tons of good streamers and video content out there.  When I came back to chess a few years ago I really liked: John Barthalomew, Chess Brah, Daniel Naroditsky, Gotham Chess was okay, Agadmator does thousands of reviews of top games from Morphy to current.  There are so many out there that really help from beginner to master.

Work on chess principles and endgames first.  If you master the endgame you are gonna have a much greater understanding of the game and pick up tons of wins if you don't resign.  Everyone makes blunders.  Learn to capitalize on them.

Yeah here is a link to Den of Patzers.  They are pretty active and will help you.

https://www.chess.com/club/den-of-patzers

Yeah there are tons of resources online, or you can go to Den of Patzers

Also may I ask who told you that this was a good place for tips

You can private message me if you want to chat sometime

In the meantime, here are some things to get you started:

For the chess opening, learning fundamental chess "opening principles" is probably more beneficial than memorizing opening moves: 

https://www.chess.com/blog/KeSetoKaiba/opening-principles-again 

For the endgame, learning basic theoretical endgames and basic checkmates are also useful. One of the most core theoretical endgames to know is King + pawn vs King. Usually the side with just the single pawn can force a win, but sometimes it is a draw with best play. Knowing how to convert to a win and recognize when a win isn't possible is a great confidence booster because if you can master this "simple" endgame, then you have the confidence that you can win with even just one extra pawn  

I'd estimate most players under 1200 chess.com rapid rating can't even win consistently with just an extra pawn, so if you have this confidence and ability to do (using King Opposition to convert), then you already have a great start to endgames and you can even try to steer middlegames into endgames like this you know you can win.

Yes understanding opposition is like the theory of gravity for endgames ;-)

I am new to online chess. My biggest weakness is tunnel vision and making blunders. Getting sniped from long diagonals is my most common blunder. Even though I know the main opening principles I get confused after a few moves if my opponent plays moves that don't work for the opening I'm trying to play. Hopefully I can get advice and practice to help me improve.

Almost everyone goes through this phase.  The key is playing time controls slow enough so you can do a blunder check before every move.  The longer you play the faster you will be able to do this.  You literally have to make sure. 

A.  You have no pieces that can be taken for free, or any 1 move checkmates. 
B. See if your opponent has left any free pieces or 1 move checkmates. Don't think your opponent can't make mistakes cause they often do.
C.  The move you are about to make, make sure you didn't unguard a key piece or pawn and make sure where you move to it can't just be taken for free. 

You should get into a habit of doing this every move.  The more you do it the more patterns you will start to recognize.  I'm sure someone here can elaborate on this and improve what I am trying to communicate.  I'm only around 12 to 1400 player.  I still make simple blunders from time to time.  Usually about 1 to 2 per game depending on they type of opening it is.  I'm way too aggressive ;-)

Thanks!