The best resource I've learned the most from on skincare and how to approach it is Charlotte Palermino. How to layer things, how often to use something, and how to adjust. She is incredibly knowledgable but also pragmatic which I appreciate. Charlotte's general skin rules, and some guidance on using retinols here and here.
Marie Veronique Balancing Toner
Beauty of Joseon Rice Milk Toner
Beauty of Joseon Calming Serum
Experiment Barrier Support Serum
Dermalogica Liquid Peelfoliant
Apostrophe Tretinoin/Azelaic Acid
Musely Estriol Aging Repair Cream
Dieux Instant Angel Moisturizer
Beauty of Joseon Dynasty Cream
Beauty of Joseon Aqua Fresh Sunscreen
Isntree Hyaluronic Acid Sunscreen
Then I Met You Resurfacing Mask
Dr. Idriss Major Fade Flash Mask