What actually saves you money?

I love cooking and baking but I have 3 kids and obviously need some convenience.

I’ve just started a sourdough starter (however my kids prefer white bread lol) I’ve been making rolls for a few weeks which have been a hit and really cheap.

I’d love to make butter but also, why? I’d spend a decent amount more on the cream lol so I won’t do that even though I would like it without additives ect

I would like to eventually get chooks so I don’t need to buy eggs, but what else is there that you can make from scratch that is actually worth it?