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For core concepts and general knowledge to get you started I highly advise looking at https://www.w3schools.com/ https://appinventor.mit.edu/
First: You need to dig around and figure out what sites to use. Start with Stackoverflow and Github. Depending on what you are looking up you'll want to use specific sites. For example: Your Linux Distro (especially forums). If you use a Debian based distro, the Debian site. Linux "man" pages. Microsoft documentation. Official pages for the programming language.