What is the best Latin grammar?
Gildersleeve and Lodge is one of the best, and every point made is supported by a quotation from a Roman author. Allen and Greenough is also good. You can find links to online versions of these at the bottom of this article: Latin grammar - Wikipedia.
Is Latin grammar easy?
If there's one thing that everyone who's studied Latin could agree on, it's that the grammar rules are incredibly hard. The word “declension” is enough to send shivers down one's spine. The word order is arbitrary, each of the verbs has several cases and all the nouns have gender.
What is the best method to learn Latin?
One of the strongest and most effective ways to improve your knowledge of Latin is through reading books to learn Latin. This can be reading ancient Romans, such as Cicero, Caesar, and others, but it can also be from short stories and novellas written for contemporary audiences and Latin learners.