As for photographers, I wanted to ask how to advertise their services on the Internet? I'm shooting wedding photos and videos. I work in several cities close to my city. Is there any way to use the sites in my region where I can advertise my services? For example, blogs or forums in my region.

Yes, indeed, unfortunately worthwhile ideas are sometimes stolen and the author of these ideas will be left without remuneration. Therefore, you should always patnet for worthwhile ideas. Just such companies that are described here can help with this.