Wikipedia is really a good start to do any research, you will first find a list of all the available works people have down previously, and a number of terms you will need to understand
Google Trends is another good place for comparing popularity before you decide to jump into some boat
Zhihu and WikiPedia are really good start to do any research
google quick start guide to obtain a brief view, so you know the key components.
always search the exact problem or error message first, for
search for the awesome list first for a good source of tutorials