How can i learn German Grammar?

[William.gh]

Is there a way to learn it inside of duolingo or i must use another source?

Thanks.

[LaCroixRouge141]

Use other sources, like youtube channels. I my suggestion is start with Learn German with Anja.

[LaCroixRouge141]

She explains a lot of questions in a few minutes.

[gatiquo]

Try to find a used German grammar book.