The Arduino IDE is pretty friendly, so it doesn’t try to install things like boards for all users, since that would require root. The board package you loaded winds up in your home directory ...

The Arduino IDE supports multiple files by adding more tabs. If you use INO files you’re only adding one at a time, but if you use C/C++ header and source files it’s two at time.

The official Arduino development team has this week announced that the latest Arduino IDE 2.0 has now been made available as a stable release and is now available to download.

I usually make a quick servo tester on a breadboard and use the serial monitor in the arduino IDE to get the servo positions, ...