Hello @dev8162367363, welcome to the forums! There are a few sites that I visit often: these forums and
stack overflow. Personally, I find coding-related forums useful for finding information out, and finding ways of doing things, as the descriptions provided are made by people, and are often explained. You will also find many different ways of doing the same thing, which helps increase your knowledge.
As for websites, W3Schools is quite good for checking syntax, or checking the use for a specific method. Geeks for Geeks is also another website that I use regularly, and it has a similar application to W3Schools, but I find it gives slightly more in-depth answers.
And then there’s also the language’s (whichever language(s) you want to find out about) docs which are very useful for learning syntax/built-in methods.
I hope this helps!