I've had more luck leaving an empty hive around for capturing swarms, although I keep trying w/ traps.
Its fine to just let your bees swarm (if you also capture them) and fly away (your neighboring beeks will appreciate that :-D), but its better (for bees and you) to produce an artificial swarm by a number of methods of basically "keeping your broodnests open" with regular frame manipulations and/or splitting colonies, making NUCS, banking queens, etc. Allowing bees to endlessly swarm will not build up bee populations, yours or feral. I used to feel the same and still let (fail to prevent) some swarm despite attempts to prevent them, but just letting them all go begs the question; Why keep bees then? :?
If you 'really' want to keep bees and expand your knowledge, go back to the beginnings of this forum and read, read, read. Its what I and many others did/do. Can't say enough about this. All the info you need is here, literally at the fingertips for those seeking answers. Its extremely difficult to provide 'general' answers to 'general' questions as you'll learn as you get into keeping bees, but do your own homework, its important.
Lots of beeks hate frame feeders, but some like them, check out the debates on this forum. Only got purposely stung three times this season which kinda bums me out because 'one' of the reasons I keep bees is for apitherapy for arthritis, forcing 'me' to purposely kill a few (I hate killing bees) for relief.
That said, don't ever fear asking direct, specific questions, but be prepared for ........well...., you'll find out ;) Have fun.