Answer:
it is important to choose skin care products based on skin type because
1. you'll be wasting money on stuff not for your skin type
2. products not for your skin type may not work
3. you may have a bad reaction to products that aren't for your skin type
A serving size is how much of it you take for yourself, and portion size is how much out of the whole thing.
For example cheeto puffs, a serving size would be one of those little mini bags. but a portion, is probably just a section of the chips. mean serving size is how many youre going to eat but portion is just a chunk out of the entire thing