Ask HN: Is there a GUI for bash shell?

I know I will get a massive shitstorm, but I always forget the flags and options for the numerous linux command line Tools like grep etc. I'm using the shell from time to time and so I'm not using the commands daily and forget about them. So my question: Are there any Tools to help here? I do not mean a man page but some kind of GUI for the commands or something like regex101 for a shell command.