Think about the reasons you want to learn a new language and the goals you have for using it. You'll be better able to concentrate and get more done if you do this.
Use media (music, movies/TV, books/articles) and real-world exposure (native speakers, friends, etc.) to improve your grasp of the language.
Master the fundamentals of grammar, vocabulary, and pronunciation first. Any textbook, language-learning software, or online course will do to get you started.
Dedicate some time each day or once a week to language study. Because of this, you will be able to remember more information and develop your abilities.
If at all feasible, try to use the language in authentic contexts. You can gain self-assurance and increase your fluency by doing this.
As with any other talent, language is best preserved and developed through regular use and practice.