This system is probably the easiest to explain and the easiest to execute. It is based on the premise that different punters experience winning streaks and losing streaks at different times.
In the Ape strategy, you are copying other players.
Look out for the person on the winning streak and “ape” their bets.
OR, look for a player who is having a terrible run of bad luck and play the exact opposite moves.
If your winner’s luck continues, stick with them. If their luck starts to go off, find another punter to “tailgate”.
Obviously this strategy works best at land based casinos and live roulette online when there are a decent number of players at the table.