Usages of yǔfǎ
老师 先 说 语法， 然后 让 我们 写 句子。lǎoshī xiān shuō yǔfǎ, ránhòu ràng wǒmen xiě jùzi.
The teacher first explains the grammar, then lets us write sentences.
我 喜欢 自己 先 复习 语法， 再 写 汉字 和 生词。Wǒ xǐhuan zìjǐ xiān fùxí yǔfǎ, zài xiě Hànzì hé shēngcí.
I like to first review the grammar by myself, then write characters and new words.
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.