Hi @pepito and welcome to the forums.
As you are new to SEO (Search Engine Optimisation), I recommend you read Google’s “Search Engine Optimization Starter Guide”. It’s very clear and helpful. There’s more to SEO than simply getting backlinks (whatever some folk seem to think ) and this guide will get you started in the right direction.
There are also many threads on this subject in the Marketing section of the forum, and you might find it worth your while to have a look at this one, in particular: