The usual caveat : everything can be modified (being root only needs to check in the "developer" mode in the parameters, nothing fancy to do!), so everything can be broken in some way.

So when you are doing something tricky (like dd commands on filesystems, or patching some important things like the homescreen), double check your commands, backup before, and try to keep a plan B ready (like wifi enabled with SSH actived, to be able to restore things from a computer if the display doesn't get responsive after a change). If something is broken, usually a factory reset is enough to get it back on track.

For "normal" things, like applying well known patches from the community, there is usually no problem, but backuping your important files (if any) before is always safer.


Happy hacking !