How do I use the log?

I'm learning Spanish right now, but that's not what I want to use the log for. I'm wondering if I'm allowed to use it to track progress on my constructed language (conlang)? It's a cool idea (to me, at least), but it isn't a real language, so I'm unsure if I'll get in trouble for that. Let me know if any of you would actually read about my conlang, too.

Yes, you can use it to track progress on my constructed language.