LOG what does mean green, orange and red lines ?

In LOG have red, orange and green lines.
What does mean ?

Red > unknown code to thread ?
Orange > partial emulated code ?
Green > complete emulated code ?

also what does mean the word TODO in orange lines ? unknown game code to be implemented in emulator ?

That information help how report future bugs.

Right-click the log and you can see that there's different levels of errors. Purple is fatal and the main one you should be looking out for. Red is an "error" but not always going to be something bad or something meaningful, it's very hard to give a guide on what to look for and what not to look for because it's always changing and there's hundreds of different types of errors that can be reported.

Orange TODO generally indicates something that needs to be implemented.
Green is just a success message, it can be handy if you see e.g RPCS3 compiled a shader or module right before it crashed then you can run the game a bunch and if it keeps crashing after compiling something that might be the issue.

The problem is, a lot of the time RPCS3 can crash without writing an error to the log, so you look at your log and think that the last message in the log was the reason it crashed, when it wasn't. It really depends, sometimes RPCS3 can crash gracefully and it can write an error, sometimes it can't.

Thanks very much for your reply will help me in better details in future bug reports.
Have an nice week.