The best chess tactics and strategies?

Answer 1

In a king pawn opening (with white), use openings that attack the opponent's king pawn on e5, e.x. Scotch, Spanish, King's Gambit, Goldreng Gambit, or the Ponziani openings. With black, defend your e5 pawn the best you can with reasonable moves, or play the French, Russian, or the Sicilian.

With the queen pawn opening, I highly recommend the Queen's Gambit for white, and to defend against it, accept the gambit and prevent the opponent from gaining effective tempo and castle queen-side, or decline with the move e6 and later castle king-side. In the middle game, get your pieces to the best positions possible and with like pieces/ with supportive pieces. In the endgame, center the king and attempt to promote the pawns remaining while avoiding checkmate and attempting checkmate.