Or just use Anki, youtube (videos in target language) and free online resources and a good novel and a bit of discipline and effort.

First of, there are a ton of great language learning videos on youtube geared for each specific language, showing their journey and tools. Most boil down to these mentioned above

There are alot of great free anki decks for vocabulary when you are too lazy to prepare them yourself. I use one for japanese made from anime lines, you learn phrases said in actual media which is nice, sometimes there are some grammar rules explained if needed. I’d suggest to make an effort yourself and watch media, take a word or sentence, cut it out with some software to a short soundfile, add it to anki., sync to your phone. The extra effort stage of finding and translating a line is worth alot. Then you have the spaced repitition from anki. But as I said, just use a premade deck instead if you are too lazy for the software setup.