Any retinol user from UK?

Hi everyone, I’ve recently started getting into skincare and I’m especially curious about retinol and tretinoin. I’ve read that tretinoin can really help with acne and anti-aging, but I’m not sure how to start using it safely. I also saw a site called DermacareHub mentioned in a Reddit comment—has anyone here tried it or bought products from them?

No, I m not used that type of product. I always prefer the natural methods.