Wich SEO tools do you use to make sure your web site is at its best?

Question

I'd like to check my website and don't trust the few known tests like the w3c one

Answer 1

Here is a list of tools you can try. Something complicated with respect to SEO is that it can change depending on which search engine you are using, so it is good to try some:

https://blog.bufferapp.com/free-seo-tools

Answer 2

Mickel thanks you for the resources, and it's awesome they are free