Novice to custom rom need help with vivo 1907

So guys I got another spare phone but it's laggy and spare so i wanna install a custom rom please explain or tell me how can I .

And also few questions pls

1st will custom rom gonna bricked the phone ever ?

2nd can i go back to normal ever if I don't want custom rom ever in future is it easy or hard

I have pc and main phone than the spare phone and pendrive and also OTG so I have heard i might need these things so i just mentioned

Please also tell what custom rom should be best for me I am mostly gonna use my second phone for photos or video or just using it as storage viewing from micro sd card on phone and also I will gonna use it as webcam with pc and also few other apps not gaming or not entertainment apps like yt or insta or anything else