Anki is spaced repetition flashcard system that helps you memorize information efficiently. While Vocaber is better than Anki when it comes to improving vocabulary, Anki is still a very useful and powerful tool that you can use as a complement. You can learn more and download Anki from the official website.
Using these is not mandatory, especially if you only care about the input.
Below are some decks that you mind find useful to practice certain aspects of French language:
Practice identifying the grammatical gender (masculine/feminine) of the most frequently used French nouns. Eventually you will notice the patterns, but some words just need to be rote memorized.
Beinngers often struggle with writing diacritics correctly. This deck helps with memorizing French accents and diacritic marks. ~2000 most common words realistically cover most of what you will normally use in writing.