GTmetrix is ​​easy to use â€“ just type in the URL you want to test, and you're good to go. But before you do that, you might want to change the configuration of the test. Just click the Analysis Options button below the Analysis button. It will only be available if you are signed into a GTmetrix account.The short answer is: no, SEO usually doesn't require (or any) manual coding. You can do great SEO work without touching code. But the long answer is yes, a good understanding of how programming works, or even the ability to code yourself, is always a good skill to have.