Complete end-to-end reference guide
What is your research effort?

There are many websites that teach aspects of the Chinese language Putonghua.
One example is the Wikibook Chinese.

Other sites provide dictionaries and, more importantly, example sentences, like Ichacha.

You won't, however, find a "complete" or "end-to-end" guide for any natural, living language. Despite many people stressing the simplicity of Chinese grammar, the fun only really starts after completing the basic structures.