1. https://hiddentools.dev/ - find any tool you need in the website making
2. https://caniuse.com/ - creating a website it tells you which features will work on which browsers
3. https://devhints.io/ - you can literally find the documentation of any particular function or code in sec
4. https://bundlephobia.com/ - This one can tell you the size of the package u need.
5. https://www.urbandictionary.com/ - real world unsafe variable names.