I regarded that as a given. If you want to clean it up, generally you already know what you want to remove. Additionally, you might consider uninstalling the software that was trashing your context menus in the first place, if you’re that uncertain.
Additionally #2: You probably shouldn’t have to install a third party tool for everything (and accepting every single addon in the process), because that caused your dilemma in the first place.

But sometimes my context menu content is just a string of numbers and letters and I don’t know what program is to what do I do with those?

Thank you,,,!!!

Selections that you’ve never, ever clicked (and don’t plan to). As for others that have names to programs that you use, the question to ask is whether you actually use the context menu that way? For example, if your Dropbox is set to auto sync and you never actually send individual file(s) to Dropbox via context menu, then you can remove. A context menu that shows options you actually use is an effective context menu.

How do I know what to delete? I’m trying to speed up my right click menus (appearing they are slow) and I know I;m not supposed to delete certain ones, but the others have names to programs I use…like dropbox etc… I wish there was someone I could call who could help me.