I just bought raspberry pi 4b for my daughter to use as backup online learning. She usually use her phone for classes and share one laptop with her younger brother. I set up the pi using VESA adapter and case with fans plus cheap heatsink from autobotic the temp maintain at 48degrees. Since I had an old monitor with dvi input, I try to use the micro hdmi to hdmi cable, then hdmi to dvi adaptor and it got display.

Use latest rapsbian and tested youtube quite smooth. MS team seems ok. Problem so far is the audio port volume very low. Solved that with bluetooth speaker. The speaker has mic function which work in my laptop but in the pi mic doesn't work. Tried using my son's edifier gs01 usb headset it work.

Now waiting for usb sound adapter. Ugreen claimed their adapter work with pi 4. The one without volume control. The one with volume control they say not compatible with pi.

So far not a bad alternatives for a desktop computer. For less than rm300 since I already got an old monitor and old logitech keyboard n mouse combo.