For an overview of the research behind the practice and tools/strategies that make it easy to incorporate into your classroom, check out https://www.cultofpedagogy.com/retrieval-practice/
In short, low-stakes quizzes, flashcards, and opportunities for reflection --without notes--helps to boost learning and retention of knowledge.
Check out the tools below for fun ways to incorporate this into class or homework time.
You can make flash card sets to share with students for review, study activities, and team review games! Great features include the ability to add images, audio pronunciation, automatic test-maker, and translation tools! Quizlet works for vocabulary, spelling, and concept study.