There no āstupid questionsā here, Tracey.
Like all things, when you are yet to start there is lots to learn. But no need to feel intimidated.
There are lots of members here whoāve travelled the road and can offer help.
I see the process of recording as a process of continuous improvement. You can do just fine with a mobile phone. Just shoot the video on the phone, share it from phone to YouTube, and paste the link into a Topic.
Then later you may want to edit the video. Perhaps add some kind of title and credits, trim the start and finish to crop the video to just your playing (and singing).
If you want to take a first step into home recording to produce music with better sound quality then you want to get yourself an Audio Interface, such as a 2i2 discussed in this topic. You can then plug in an instrument and a mic (again only needed if singing).
Once you have that setup you can now use your AI as an audio source on your computer. The next step could be to make your video on the computer, assuming the computer has a connected camera, either built-in to a laptop or a USB webcam.
You can then use OBS as the recording application. You can set it up so its video source is either the integrated camera or a webcam and the audio source is your Audio Interface. Once that is done then as simple as pressing record.
Another option, not much more tricky, is to use this software that allows you to connect your phone camera to OBS. That takes a few more steps but is also not too tricky and there are YT guides to take you through it. Itās a great solution that enables you to make a video that benefits from the camera quality of a modern smart phone and the audio quality of a home recording setup.
And all this without getting into the use of a DAW (Digital Audio Workstation). For recording yourself playing (and singing) it is not necessary. In time you may want to take things further and begin to make recordings with multiple layers, make use of digital instruments/MIDI, compose your own songs etc. But as I say, itās a journey, one step at a time.
For this discussion I am not considering how you might make use of an electric guitar played through an amp that has a USB link to a PC. I have no experience of that but probably youād be able to feed from the amp into OBS, as I assume thereād be some kind of audio driver on the computer to process the signal from the amp.
Hope that helps. And feel free to keep asking questions.