pretty/quite/rather/fairly/so/very

Please start by reading through some of our previous threads on the topic:

Thank you.
I read all of them and got some points but some more words are added to my question and the problem is doubled.

They have no irrefutable order, but I can put them in rough, ascending groups according to my feeling:

pretty,fairly,rather
quite,very
entirely,completely,extremely, absolutely

These are not in the series, to my mind, as they stand: so, almost

Now I can go and study the grammar and differences between the words of each group.
And why are almost and so different ?
And by the way, which one is more expensive here ?
-It's not very expensive.
-It's a little expensive. (Are a bit , a little and a little bit the same?)
Thank you.

And why are almost and so different? -- They do not indicate degree directly, to my mind. Compare: He is very old vs (?X) He is almost old.
It's not very expensive is cheaper than It's a little expensive.
Are a bit , a little and a little bit the same?-- Yes.

She is so beautiful.
Doesn't so mean very here ?
and about almost, can it mean "it is to the extent that you can call it...." ? I mean when we say he is almost old we that yes, he is old enogh that we can call him old. Am I right ?

''So' is a comparative to me: She is so beautiful that I cannot take my eyes off her. I have already given my opinion on 'almost'. Why don't you wait for another's?

Yes, I will.

Thank you so much

Thank you