If you are a beginner ,I recommend that you use a textbook.
I usually use “GENKI” in lessons for beginners.
The textbook “GENKI” is a comprehensive approach to developing the four basic language skills (listening,speaking,reading,and writing), which aims to cultivate overall Japanese-language abilily.
I think it is very useful to improve your Japanese.
But we can use the other textbooks,too. If you have a Japanese textbook ,feel free to tell me!