I love Isntree, Purito and Holika Holika products. They use quality rich natural ingredients and I've got some amazing results since I've moved to K-beauty products exclusively.
If you need gentle products, Etude House Soonjung toner and cream are super gentle and contain no irritants. I've used and loved their products. Super recommended for sensitive, dry, dehydrated skin.
I can help with this one! CosRX and Dr. Jart are great, both available at Ulta and Sephora. These two are some of my favorite creams, can't go wrong with either if you're looking for hydration!
Heimish all clean balm is amazing, too!