What are your tips for learning a language? English

Use different platforms, youtube (for entertainment), duolingo (vocab + refresh yourself), books, also universities may have free online lessons you can read through that teach grammar

Try to immerse yourself with the target language as much and as often as possible. It is also good to have a penpal to chat on a regular basis. There are also several apps that I would recommend: LingQ, Italki, Babbel, Mondly, anki.