Five named variants, correctly explained — including the one most sites get wrong. Not beginner rules content; this assumes you already play.
Some poker rooms allow a straddle from UTG or the button, and then a restraddle from anywhere else at the table — small blind, MP1, wherever. Whichever straddle is posted last gets ultimate last action preflop only. Normal position and action order resumes for the flop, turn, and river. This is distinct from a standard Mississippi straddle, which allows a straddle from any position but has no restraddle-chaining or last-action mechanic.