There is no one “best” grammar, although some are more widely accepted than others. It really depends on the context in which you plan to use the grammar. For example, if you are writing for a academic audience, you will want to use a more formal style of grammar. If you are writing for a more casual audience, you can use a more relaxed style. There are also different grammars for different dialects of English. For example, American English has a different grammar than British English.
Here are a few links that might be helpful:
https://www.englishclub.com/english-grammar/
https://www. grammarly.com/blog/top-10-grammar-rules/
