Probably the best way to learn openings are books . so if you want to know deep theory i would recommend buying a book about that opening but if cannot find tactics you just have to play puzzles a lot .
and for the end games you can firstable learn the eazy pawn endgames and then simply add stuff to your repertuar .
... I mainly just don't know what to do in midgame...
GM Larry Evans' method of static analysis - Chess Forums - Chess.com
same
Midgame suggests that all your plans have failed. If you feel strong but have no more attacking moves, its fine to play a strong passive move, as your opponent will have exactly the same problem. Especially on tight time games. Just not too many defensive moves. Allow your opponent to make the mistake
could someone please tell me how to add and find friends on this site?
... Possession of the centre of the board, or the area you plan to attack in, with strong, supported pawns is the absolute essential of beginners chess....
Pawns form the "terrain" of the chessboard, and they determine whether the battle will take place in the open fields or in the narrow alleyways of a town.