Use the term home education if you are in the UK, and you will find more sources and information. https://educationalfreedom.org.uk/find-your-local-group/
The curriculum is basically book taught. All the information is available. You just need to be able to read and impart the information.
There is a lot of admin, stats, meetings and reports and dealing with parents etc that takes up a lot of time and space which a home schooling parent would not have to deal with.
Most of what is taught in school can be taught in about 2-3 hours in a day, leaving the rest of the day free for useful things like teaching budgets, cooking, field trips.
Anyone with an average IQ can home school a child in their primary years. Yep. Fact. Yep, still a fact even though that enrages some of you 😅 Secondary education is trickier, but still very much possible with the resources available.
The big issue is the day to day behavioural stuff, kids being bored shitless being stuck home, not wanting to stick to a routine, mum slacking off and just staying in bed. It is the showing up and sticking to it that's hard, the information is not that hard to impart and it is all freely and easily available.
Many home schooling parents get together in groups with others to avoid the pitfalls of no socialising, to give them breaks and to make it more workable.
The UK education system is failing a lot of kids. If your kid is doing fine in school, great.
But it's entirely understandable that those who can do so choose this path for their individual children.