Thank you for your help.
You are all right. Some people here seem to get good results thanks to their own search engine optimization methods.
However, handling a website requires a lot of time, and much more for those who own many sites.
So I guess I should learn SEO too, especially if I plan to create more sites later.
Do you guys have obvious and well-known tips for optimizing a website ? (like on-site or off-site optimization methods) ?
Thank you.
Thomas