Lots to unpack there! Yes, the benefit of calisthenics is you don't need weights or any special equipment besides hopefully some kind of bar, rings, tree or door-frame to do some pull-ups on!
I think you're also saying that strength training is great, but remember to also do cardio/fitness exercise for the good of your heart, lungs and the flow of blood around your body! So in my case, remembering to surf, run or do the fitness aspect of boxing/kickboxing (skipping/sparring/bagwork), but other people could choose to do soccer, swimming or some kind of cycling as well!
You get people who think that cardio will make them lose their muscle-mass and don't do any at all as a result, but I think that's terrible and only a marathon runner is potentially doing THAT much cardio!