The fastest way to learn a new language is through immersion, only being confronted with the language you want to learn, and coming in contact with your own as little as possible. An exchange student visiting a different country can become proficient in a previously unfamiliar language within a month, assuming they don't fall back to communicating in English. Here are some tips on how to work on each of the points mentioned:

* Vocabulary: Change the language of familiar interfaces such as your PC or your phone to the desired language. You can also try navigating shopping sites such as Amazon to familiarize yourself with a wider range of words. If you still find that there are words you are unable to encounter frequently enough, you can use flashcards to learn in a more conventional way.
* Grammar: Only focus on learning grammar when you realize you are unable to understand the meaning of a phrase you encounter. Textbooks are a good collection of grammatical rules, through the structure of the rules can differ from book to book. Research beforehand to find a book that presents the grammar of the language in a way that makes sense to you.
* Reading: Read articles and short text on subjects you are very familiar with. This will help you fill in the gaps. If the language uses a different alphabet or writing system, writing the letters or symbols repeatedly and using flashcards is a great way to become accustomed to it.
* Writing: If the language doesn't use the writing system you are familiar with, decide whether you want to be able to write it by hand. If you don't think it's necessary, you can only write on your PC or phone.
* Listening: If your favorite movies and series offer a dub in your desired language, watch them. Your familiarity with the story and scenes can help you fill in the blanks whenever you don't understand something.
* Speaking: Ideally, you should talk to as many people native to the desired language. If that is not possible, you could seek out online spaces designed for language exchange such as HelloTalk. The users on platforms such as these are often highly motivated to learn and teach themselves and can help with other topics pertaining the language.
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