Counting with 個

I'm very new to learning Japanese. After learning some basic sentences I started with the numbers.

I fully understand the kango numbering.
However, with counters I ran into some difficulties when learning.

I get that when counting from 1-10 you use the general wago numbering.

Is it correct that when you count from 11 onwards you just use the kango numbering and add 個(こ) behind it?