It depends on the discipline in which you play (multi-table tournament, jackpot spin, 6-max cash, fast poker, etc.), on the number of players at the table, on the depth of the stacks. In tournaments, the stage is also important, as the ranges will be different for the start of the game and for the final table. For example, you can use poker charts for various disciplines. There, hands for open-raising, all-in and for folding are usually highlighted in a certain color. The most common cards to fold in Texas Hold'em will be marginal unpaired hands of different suits that can't make a straight, flush, or strong top pair.