New Vocabulary

Привет! Just wondering if anyone would like to share their methods for how to keep new vocabulary straight?

I'm keeping a list of new words as they come up in the duolingo lessons, but it seems that after a while this is not the most organized method--the list will become unreasonably long and it will be difficult to find words if I need to later. I'm not a fan of flash cards--they're difficult to keep track of. I prefer the tidiness of a notebook.

What do you all do? Any ideas for how to organize my notebook?