OBS
Dead easy to use for streaming is obs, its free and works fro mac, pc and linux. It runs real smooth on a Rasperberry PI 5, so you can make a really stable streaming box for under a hundred quid.
Its also dead easy to get it up and running in minuets, it helps you to get streaming keys from all the normal streaming services, and allows you to mix from live cameras, media or even computer windows (handy for streaming max/msp/jitter patches). It also captures audio from different sources. Its so easy to use I havent written instructions.
heres a link to install it on a raspberry pi
to install on a raspberry pi type in a terminal “sudo apt install obs-studio”