How do you use Anki to improve your learning?

I practice daily with Anki on a mobile phone, mainly to learn a language (Spanish).

Beyond Spanish, my cards touch on many other subjects. Some are stuff I want to remember all the time (whether related to work or general knowledge). Other are cards I prepared for some exam/professional qualifications. After the exam, some of those cards moved to the former category, the rest are now archived.

I find the "cloze" cards to be particularly useful. Also, [Syntax Highlighting for Code](https://ankiweb.net/shared/info/1463041493)