This is all great advice! I would add:

1. Youtube is great for how-to videos that will allow you to take care of a lot of small repairs more or less for “free”, but it’s not interactive. Use this Lemmy community and/or diy.stackexchange.com to crowd-source solutions to your problems (explain the problem and post a few photos) that you can then watch videos about.
2. In regard to tools, I like the following rule: when you first need a tool, buy the cheapest one that will get the job done; then when it eventually breaks (because you’re using it for new jobs) buy a good-quality one. This way, you’re not spending extra money on stuff you’re only going to use once or twice.
3. Laws in the United States allow a lot of work to be done by the homeowner, especially when you’re replacing “like for like” (e.g., swapping out an electrical socket); but if you’re doing more than that, check on whether you’re going to need a permit from the local government. In other countries, laws may require licensed contractors perform certain work (e.g., electrical and plumbing).
4. Take care of emergencies, but then get comfortable. It’s your home, you’re going to spend lots of time there, so you don’t want to be living in a construction zone for a decade. Work towards a standard of living that you (and your family) can not only tolerate but have some level of comfort in.