An up to date Tutorial form backend update on the users/me?

Hi , everyone ! I found a ton of tutorial for doing update on the /me but none are up to date and I’m being stuck each time , is there a tutorial where I can do it ? The documentation is a little hard for me to understand alone, the route are not in the same path on the doc and the tutorials I found and there is the same problem for the content of the user permission they differ. Thanks for the help

I love fabform its a great form backend service to integrate.