I have money but no knowledge...

I am after advice on my personal situation and also looking for resources on how to learn about finance starting from knowing nothing at all. I mean really nothing, yesterday I had to google what an ISA was. Does anyone recommend books or a youtube channel? My husband and I grew up very poor and investing money instead of keeping it tucked away has made us feel nervous and we have been avoiding doing anything with it. We are late 30's.

My husband and I have £130 000 in a savings account

A mortgage we took out 3 years ago for 480 000 and we have been paying 1600 per month on it.

I'm a stay at home parent and husband earns on average 5000 per month. Our outgoings are high and we usually end up spending most of that. We are kind of bad at budgeting because we see we have money and if we need or want something we have the ability to get it so we don't stick to it. We don't spend more than he earns but we have stopped saving most months.

We will find out shortly if we need to spend £30 000 on medical treatment later on in the year. (Will aim for June/ July)

I would like to start something for my toddler that can hopefully turn into something big later in life. (To travel after high school, go to university or even a house deposit in their 30's if that's possible)

We are too nervous for high risk investments I think, but I also don't really know what that means.

I really appreciate anyone who responds - thank you so much.