How to film by my self?

I want to start making videos, but not crappy ones. The only thing is I have no crew and would be the only one filming. Is there away I can film and act at the same time? Please no hate I know people do it alot. I also want to be able to switch scenes with out moving the camra around. I'm pretty sure that's possible? And last but not least I want to be able to have myself be on a scene more then once. Like " clones" . If anyone can share some info It would be awesome. Thanks(ps I'm not in love with my self I just want to be a better filmmaker and editor. I'd be happy for any other tips as well! :)