@YGNR i'll try to answer the questions you had earlier on post #23
if he told you to play 30+30 matches, it means that both players have 30 minutes in total and 30 seconds increment (meaning: you get 30 seconds bonus after each move)
example: 5+3 is 5 minutes total and 3 seconds added each move.
classical format means that those are longer games, (example 30+30), rapid would be something like 10+0 (just one example, can also be 8+3 or anything around that time), example of blitz: 5+0, example of bullet: 1+0
aggressive does NOT mean faster, it means just to move pieces in a bit more aggressive way (to attack more), but i wouldn't worry much about that for now
opening principles: just something that you want to do at the beginning of the game, you want to develop your pieces, you want to castle as soon as possible (in most cases), try not to move the same piece twice in the opening etc...
endgames are the positions when you and your opponent have only a few pieces left on the board (example: king+rook+pawn vs king+rook).it is important to learn how to play those positions because you will encounter them very often
you can solve puzzles here on lichess at the "learn" section, one move will be much better than the others and your goal will be to find it
you can tell the players rating by putting your mouse over their name and it wil pop up (if you put your mouse over my name you will see the number 1591 and if you put the mouse over that number you will see that it is a blitz rating, meaning: games that take around 5 minutes
there is not much to explain about positional play and tactics, just try to understand why a move is good or not (why you don't want doubled pawns for example(double pawns-two pawns one in front of the other))
also if you dont know how to go to analysis board here on lichess- go to your profile -> games -> *choose a game that you want to analise* and click it -> on the right side click "ANALYSIS BOARD" -> scroll down and click "computer analysis" or "request a computer analysis" -> wait a couple minutes and then you will be able to see which moves were good or bad (if a position is +2 that means that white is winning at that moment, same with -2 and black, something like +0.4 is equal for example)
if you want to do random moves from the opening and see if they are good or not, click tools -> analysis board at the top of your screen and you will be able to play moves and see what the engine thinks of them. also in the analysis board if you want to see what the engine thinks be sure to "toggle local evaluation" at the top right just below your name. (it might be toggled automatically but just in case)
i tried to explain as best as i could, hopefully you understood and learned a bit
for any questions feel free to message me