EDIT:
the best way to install any app form open repos (like a YT client) is to install Storeman and then install the app from there. To install Storeman you should follow instructions here (thanks @olf).
https://openrepos.net/content/osetr/storeman-installer
If for any reason you do not want to install Storeman (not recommended) you can still install an app with the following method (in this example Microtube), however you will not receive any update this way.
END OF EDIT
oh, I am no dev either, actually at the other side of the spectrum. So if you what to make your life easier, follow attah suggestion and install Storeman. If you just want to install a player I can tell you what I did on my XA2 to install Microtube. Make sure you also have an arm device.
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On the phone go to Settings → ? Untrusted software and activate Allow untrusted software.
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Go here:
Node.js | OpenRepos.net — Community Repository System
and download nodejs-12.17.0-1.armv7hl.rpm -
Go to the download folder of your File Browser and click on the file you just downloaded to install it. If you haven’t installed a file browser just go to Settings → Storage → User Data → Downloads and click on the file…
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Go here Microtube | OpenRepos.net — Community Repository System and download the most recent version, as of today: microtube-2.1.5-1.armv7hl.rpm
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Repeat step 3. You might need a reboot before using the app. You’re done.
If you are using a more recent, aarch64 device, just do the same things but you should install
this version of nodejs:
https://openrepos.net/content/mistermagister/nodejs12
Then also pick the aarch64 version of Microtube in step 4.
Maybe you’re still in time to play that Christmas song playlist