Document how to look for phosh crash issues (or crash issues in general)

While working on the virtual keyboard, some builds are making phosh crash on startup; I get the login prompt, then if I try to start phosh by hand the screen just turns gray.

Looking for phosh logs inside /var/log I couldn't find anything significant...

Could we have some documentation on:

• Where to find log files
• What are common/known issues that might crash phosh (like, maybe, nvidia proprietary drivers? Asking for a friend)
• What are the required logs and system information to send proper reports on phosh crashes

Thanks a lot :)

-- Edit to include information from the chat: --

To get some logs about phosh, use:

journalctl -b 0