Calorie deficit - Absolutely LOST on workin it out

[Doteycat]

Seriously. Can someone please help me, explain it in simple terms?
How the hell do I work out how many i should be eating to be in a deficit?
Ive done SW and while it works, id much rather do a calorie deficit and know what i was doing. But as much as i have read online, and downloaded myfitnesspal, I cant seem to get a handle on it.
ANY advice would be greatly appreciated indeed.

Tdee is the amount of calories to stay as you are. Reduce this total by 20% for weight loss.

https://tdeecalculator.net/

Thats it? Thats all i need to figure out?
Jees, thanks so much!!
I made this way to complicated lol.

I think I saw it on Instagram by a fitness person. It’s helped me lose nearly 4 stone.

You have to recalculate periodically as you are losing as it will change. Then, when you get to target, work out the TDEE again and use the maintenance calories to maintain your target weight. Good luck!

That make sense! Thank you !