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there're many different platforms :)
youtube dtube dlive facebook instagram, etc. just use one of them (or maybe all of them?!) 😄

but how do I use them? That's what I would like to learn. How to do ...

well, there's so much info out there i just can't summarize everything for you.
all you have to do is either go to one of them and start doing it right now. or start googling 😃👍