Squats and bridges are your bestfriend. This list (https://www.mensfitness.com/training/build-muscle/15-exercises-develop-best-glutes-gym) is pretty comprehensive, but I'll start with compound movements (deadlifts) on Easy Mode with good form before experimenting more. Don't overload on the weight initially; form is more important when we're talking about glutes.

@thegrimmy: I recently rediscovered his and damn he's hot. Anyone know if he continued making more videos? or did he just disappear? I cannot find him either