Ask HN: How can I learn smartphone repair online?

Context:

I prefer smaller phones and currently use an iPhone 13 Mini which I plan on using for another 3 years. Sadly the battery keeps on dying and I'm on my second battery. I prefer repairing myself since most of the local shops provide lower quality batteries and I'm a bit paranoid of leaving phone there. My screen is also broken and also the back glass. I'm thinking of ordering few replacement parts from Aliexpress and was wondering if there are any good resources to learn other than phone specific guides on ifixit.