Are there any great skin care products?

I used to focus solely on cleansing power, using harsh cleansing products. However, I recently switched to a cleansing oil known for its gentle ingredients. Since then, my post-wash tightness has noticeably decreased, and I'm very satisfied with it. The formula isn't too heavy, so it barely irritates when rolling, and it emulsifies quickly when it comes into contact with water, so it washes off cleanly without leaving any residue. It also seems to soften the blackheads around my nose, so I plan to continue using it. I recommend this product to anyone with oily skin who might be hesitant to use oil, as it's lightweight and can help manage sebum without too much hassle. However, I'm curious: is it necessary to double-wash with a foam cleanser after using a cleansing oil, or is water sufficient as long as the emulsification process is perfect? ​​I've heard that a thorough cleansing is the beginning of good skincare, but are there any side effects that can occur if I skip the second cleanse? Or are there specific recommended cleansing methods for different skin types? Knowing how a single cleansing routine can make a big difference in my skin has made me more careful.