I'm a beginner and i need tips & help.

Hey everyone. I used to play chess with my dad back when I was in the 3rd grade. After that, I haven't played in years. Now that I'm back I keep loosing pretty much every single game. Id just like that the community would help me improve and tell me where do I make the wrong move and so on. Here's the game so you can analyze it and tell me my mistakes.

Have you completed the lichess Chess Basics? That's a good place to start. Alongside with tactics I'd suggest to study some basic opening theory, so you'll understand the idea of developing your position instead of just attacking opponent's pieces.

In the game above your biggest mistake was 8. Nc3 as it leaves your Bishop unprotected. Nbd2 would have protected the Bishop.

edit: actually the moves 18, 19 and 27 were bad too but you lost the game with 8. Nc3

ps. nice nick

Toistan vielä kerran: puhukaa suomea, niin että muutkin ymmärtää..😀

6 Bc4 was weak: better trade 6 Bxc5 so as to avoid your pair of doubled, isolated weak e-pawns.
9 Nc3 is a blunder that loses a piece and the game. You could save it with 9 Nbd2.
At this moment in this 30+10 time control you still have 29.15 minutes left on your clock.
So you lost the game in the 17 seconds you spent on 9 Nc3.
In a 30+10 time control you should think about 40 seconds per move.
The best way to play 30+10 time control is to use all of your time by move 30 and then finish the game on increment.
I recommend you to switch on move confirmation in your profile. Think about your move, play it, check it is no blunder, the confirm it.

For general improvement I'd suggest watching masters who stream games, using the Stockfish analysis, and hitting puzzles.

2 d4 is a move I don't like. I can't say it's wrong, it's probably fine when you know what you're doing, but you're weakening your center pawns immediately.
4. Nf3 only guards a pawn that isn't being attacked. You want to either play Be3 now to block their bishop, or attack the undefended knight with your bishop or your queen.
5. Bf3 is weak here, doubled isolated pawns are very very weak. I'd probably throw that f3 knight onto d4 to block the bishop, then reinforce with be3 on move 6. You'll lose the e5 pawn but if it's doubled it's not worth much anyway.
6. Bc4 is doing nothing productive apart from allowing castling; it's putting your bishop in an undefended position in order to attack a pawn that's guarded twice. Bd3 would be better, that knight's still undefended. c3 is also an option, to stop the Queen from getting to b4.
8. Nc3 is a bad mistake, losing the white bishop for free. Nd2 is the choice here; it guards the bishop from the queen, is guarded by the other knight, and connects your queen with your rook after the knights are exchanged and b2 is captured. But you're already on the back foot here, and I don't think there's any saving the e5 pawn.
9. b2xc3 is not the best move here. At least make bxf2 first to save a pawn and break castling, but you might actually want to do Qd3. The game is already lost if your opponent makes no mistakes, but your bishop is your strongest piece now, and you want to keep it alive to have any chance at a counterattack. The knight can't attack the c4 or d3 in one turn, so if it moves you have the time to push the c pawn, and if queen takes b2 you can castle and connect your rooks. If they're sloppy about their knight you might even be able to win it back.
10. Qd4 inviting the exchange is bad for you. When you're up, simplify, when you're down, complicate. You're down a piece, you can't win if you make even trades. You need your queen for any hope at all.
11. O-O-O is another big mistake; your pawns are broken on that side, none of your pieces are over there and your opponent has most of his pieces over there. Your king is exposed and your opponent is just going to roll forward with no way to stop them. With so few threats on the field there's not much advantage to castling at all; something like Kf2 would connect your rooks and be just as safe as castling kingside.
18. Rd2. The game is definitely over by this point, but the best move would have been Qf2, guarding everything under threat at once.
19. Qe1. Super duper over at this point, but Ne1 would have been better. The opponent won't capture it with their queen and they don't have a dark-square bishop anymore so the knight would be safe for a while.
27. Qxd8 doesn't help. You want to make Qxh6 with threat of checkmate. The queen can't check you from here, and if they try to defend with g6 you can take with the rook and force a draw. If they realize they can sacrifice the rook to get their queen to b1, you'll still lose, but when you've this far down, always give the opponent a chance to mess up.

I would suggest you to join a local chessclub. They are usually very helpful when it comes to helping beginners. Other than that i would suggest you to start with basic endings and tactics.
Why endings? They'll make you understand the pieces, improve your tactical vision, improve your technique, improve your patience (which is a very important factor in chess) and give you a solid foundation.
The opening seems very important as a beginner, but don't do that! The principals will bring you a far way and opening theory is not only very time consuming, but also useless, because once brung out of the book, you can't find yourself comfortable in the middlegame. Capablanca never learned openings and many strong masters will tell you to NOT focus on the opening as long your middlegame and endgame is ,,under construction".
What you truly need as a beginner and also in your whole chess career are tactics. As a beginner i would suggest you to focus on tactics for half a year and play chess with some friends (when you have no friends playing chess, join a chessclub). In case you find tactics boring over the time, analyse some master games (WITHOUT engine help) and either controll your analysis with a stronger player, or look for a video analysis on youtube.
And btw: It's best to analyse games from the 1900th century and then move on to the 20th century. This will help you to understand the development of the playstyles over time and will also improve your chess. But always keep in mind: Endings, tactics and enjoying the game are the most important factors to improve.

Thank you, everyone, for all the support!

Good job good job , little by little you will be better don't worry , but for now my advise is to play basketball and eat salmon and read a lot of books like Harrison book in internal medicine , did you know that Lyme disease is an infection disease? Patch machine people, good luck in your life and you every thing welcome welcome welcome ❤❤❤🇲🇦🇲🇦🇲🇦🇲🇦🇲🇦🇲🇦🇲🇦