The best Python tutorial I've found online is the one by Socratica at https://www.youtube.com/watch?v=bY6m6_IIN94&list=PLi01XoE8jYohWFPpC17Z-wWhPOSuh8Er-&index=1 It's SO well presented, and with a deadpan sense of humour, that I enjoy watching them even though I already know the aspects of the langu...

The Manjaro (Manjaro is based on Arch) ARM project have just released 64 bit versions for RPi4. There are 2 editions:

Minimal: https://manjaro.org/download/arm8-raspb ... 4-minimal/ (no desktop)
XFCE: https://manjaro.org/download/arm8-raspberry-pi-4-xfce/

Pull the mains plug out of the wall socket, or, if possible, switch off the mains socket.

I don't know which of these is a better solution than pulling out the mains cable from the Pi.

Pimoroni have a Fan SHIM at https://shop.pimoroni.com/products/fan-shim, which they say is "Compatible with Raspberry Pi 4 (and 3 B+, 3 A+)". They also say "Oh, and it's compatible with our new Pibow Coupé 4 case for Raspberry Pi 4!" but don't mention compatibility with eg, the official RPF cases.

It all seems so simple online, but when I type it, it's rarely the same result. As linux command lines for a beginner can be long, complex, & not easily understandable, it is easy to make a mistake when re-typing them. It is much better, if you can, to copy and paste the commands. Run the commands ...

It may be a permissions issue as the php code will be running as a different user when accessed via a browser, than it was when you ran it from the cmdline. Have you checked the Apache log files? (I'm assuming that you do have php working OK within Apache.) Here's a discussion of a similar issue: ht...