What I want to know is the aperture numbers.

What is the larger aperture f/numbers in lens that lets in more light?

What is the lower aperture f/numbers in lens that let less light in?

Because I read this

A larger aperture with a (smaller f/ number) will have a very (narrow) depth of field

A larger aperture will let in more light but will have a very (narrow) depth of field

But are these smaller f/numbers? he is talking about

Also

A smaller aperture with a (larger f/ number) will have a (wide) depth of field.

A smaller aperture will let in less light but will have a larger (wide) depth of field

And again what do he mean in larger f/numbers?

I was told a larger aperture f/numbers start from 1.4, 1.8, 2.0, 2.8, 3.2,3.5,4.0 is this true?

And

A Lower aperture f/numbers start from 3.5,4.5,5.0,5.6,6.3,7.1,8.0,9.0 is this also true

Also smaller aperture f/numbers start from 10,11,13,14,16,18,20,22 is this ture again

I am so lost in all this (dof) and aperture numbers

Please understand I am new to all this aperture numbers and DSLR cameras but I would like to learn more.

Thank you.