Hello @Mustafabugti,
Thank you for reaching out to the community!
Considering the topic you want to learn about, I want to recommend HubSpot courses that I’m sure will be very helpful to you, and they are free as well 
- Blog SEO Lesson: Building a Guest Blogging Strategy.
- Blogging Course - How to Start a Successful Blog.
I think this is a great start!
Best regards,
Diana