Some question regarding game dump and console's hackability

[gamenoob]

Hi, today I will get a PS3 of my brother, its loaded with PSN downloaded games/dlc along with disc based games too. Now I wish to play those along with testing some titles for RPCS3. Before I start messing with PS3, I need to know how safe is it. I mean, what is the current status of PS3 mod? Can every model be modded and reverted back into original for homebrew/hacktools/dumptools etc? I saw a nice table showing the details of every model so far, it was years ago. Surely many things changed, lost the url of that table too. Can anyone help me out?