People who are new to the game usually want to learn moves first: when to raise, when to bluff, how to read someone. The trouble is that every one of those decisions rests on knowing exactly what you are holding and how it compares to what the board allows. Get the ranking order wrong and the cleverest move in the world is still pointed in the wrong direction. So this site starts at the bottom: the ten hand rankings in order, then how position changes the value of the same two cards, then the four betting rounds, and finally what happens at showdown. Four blocks, in that order, and nothing else until they are solid.
The most common mistake is thinking a flush beats a full house; it does not. The second is treating position as a minor detail when it changes the value of the same two cards more than almost anything else. The third is studying showdown rules first, when most hands never reach showdown at all.
Hand rankings follow the standard order used in Texas Hold’em and do not vary by venue. Position and betting conventions described here are common practice rather than fixed rules, and table sizes change how much they matter. This site only organises reference material; it does not host any game.
Learn the ten rankings until you can recite them without pausing, then read the position section once and come back to it after a few sessions. The four betting rounds are there to be used as a checklist, not memorised. Showdown rules only matter when a hand gets that far, so read them last.