I've actually built & abandoned several decks. When I was studying in university I was focusing more on the specific usage of certain words in context, so my cards were ridiculously complex. It was good for studying for the exams, but exhausting to keep up with. Now my cards are pure vocabulary. I don't go through lists & add all the words. I wait for the word to come up in daily life, then add it. In the past I studied a lot of words I never used, now I mostly study words I'm encountering regularly. I do think this depends on where you are though. I can usually follow a conversation but just one or two words will be new to me. If you're still in the early beginning phase, you need to collect all of those super common words first.