Know each Texas Hold'em hand rank before you call or fold. See what beats what,...
https://emilysgreatjournals.quantlynix.com/posts/why-does-the-page-say-quads-1-in-4-165-in-one-spot-and-1-in-4-164-in-another
Know each Texas Hold'em hand rank before you call or fold. See what beats what, then keep a printable cheat sheet by the table. A royal flush comes just 1 in 649,739 hands