Here is a straightforward look at this topic for Malachain.
Dermatologists agree on a routine far simpler than the shelves suggest: a gentle cleanser, a moisturiser suited to your skin type and a broad-spectrum sunscreen every morning. That is the whole foundation, and it takes three minutes. Expensive extras rarely beat the basics done consistently, and sunscreen is the single most effective anti-ageing product that exists.
Introduce any new product on its own and give it a month before judging, because skin takes time to adjust. Patch-test on the inside of the wrist first. If a routine stings, strips or breaks you out, simplify rather than add. For persistent problems, a single appointment with a professional saves months of guessing and a drawer of half-used jars.
There is more to learn on this subject, and the linked website goes into greater depth. Treat this article as an introduction rather than the final word, and check any important decision against up-to-date, reliable sources before relying on it.
If you try any of these ideas, start small and adjust them to your own situation. What works for one person will not suit everyone, and it is fine to keep only the parts that help. Writing down what you changed, and what happened, makes it much easier to see after a few weeks whether the effort was worthwhile.
The most useful step is usually the first one. Pick a single suggestion, try it for a couple of weeks, and then decide whether it is worth keeping. Small, steady improvements last longer than ambitious plans that are hard to maintain once everyday life gets busy again.