Most of these questions relate to Windows based systems, which confirms how relatively simple the iPad/tablet type computers are to operate.
Of course Windows systems originate from the 1980s (see Windows history) whereas the iPad etc in their early to mid 2000s development have benefited from knowing what the Windows complexities are and have avoided them. Its called progress.!
Here are some pointers to help with topics you’ve asked about - click on the one that you are interested in. Shout up if you want any help or more information. Also let us know what else you’d like to cover and we’ll see what can be done for next time…….