The whole idea of simple poker advice can actually be quite difficult to define. What is good advice for one player will not be so good for a different type of player.
Much of what you should and shouldn’t do in poker relates to who you are as a poker player, as well as what game you are playing, and specifically your situation in that game.
Without knowing exactly what your particular situation is. any advice you get will be very general.
Having said that, there are some basics of poker that are always good advice and rarely change from player to player.