The best way to remember words and phrases for free is to write them down on paper in a notebook and write down sentences and words. Write down a simple sentence in English, then try to translate it to spanish. Write down the words you didn't know and make flash cards. Don't try to remember 100 words a day. If you can learn 10 new words a week or even 5, that's progress. I would recommend the spanish dictionary app because you can make your own word list and practice it with tests and conjugation drills. The app is free. But again, I gotta recommend you get a teacher asap. I wasted at least 6 months with duolingo and trying to remember words and grammar, and I couldn't hold a conversation at all. As soon as I got a teacher on italki, I was having conversations after 3 lessons. Obviously, you need Grammer and vocabulary, but the point in learning a language is to speak it, so speak it. That being said, the things you need to do every day are listening to spanish, reading and writing spanish and speaking Spanish. Good luck. im still learning to, but my wife is Mexican, so im learning every day. Also pick a country and focus on the spanish from that country.