Duolingo apps are a great way to practice a language you are learning. They have free and paid versions.

Duolingo for language learning:

App store: https://apps.apple.com/us/app/duolingo-language-lessons/id570060128

Browser: https://www.duolingo.com/

Duolingo ABC for children: https://abc.duolingo.com/

Duolingo MATH: https://www.duolingo.com/math