[ivansavz]

+1 for OBS. It's very easy to use (add different inputs and click record). External monitor is a must. A good (as in > $20) microphone is worth investing in to avoid annoying noises, in particular computer fan noise which is likely to be an issue given you'll be recording video.

Just yesterday I was researching how to connect an external camera like Canon EOS M50 to use as a overhead projector (so you can show handwriting/diagrams like a whiteboard), and it seems possible using https://github.com/v002/v002-Camera-Live but I haven't tried yet.

One last recommendation (to the OP) — keep the videos short. Video is great as the introduction material and to show more complicated bits, but if you can use text + code samples, I think you students will appreciate.