Difference between несколько and некоторые

Did you know that the Russian words несколько and некоторые are used in different situations?

Несколько means “some” as a small quantity, некоторые means “several” (not a quantity, but a description) and it is used when we talk about a part of groups of people or objects.

For example,

1. Я купила несколько новых книг. I bought some new books.
2. Некоторые новые книги очень скучные. Some new books are very boring.