Bodyweight fitness is a thing, so its possible to do with nothing but you and walls.
Having said that, you want a bench that inclinea/declines.
Adjustable dumbbells gets you max variety of exercises with a small thing. Personally I find it easier to bench press a single bar, then balance and coordinate two dumbbells, but presumably that works different muscles and is good to do both.
body weight / ankle weight / bands is one of my workouts of the 3. Mainly I'd just like to take about 6 of the other 12 I do back home and also make it so I could do those quickly in between breaks, waiting for food to cook, etc.
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