If you are writing blog posts you should be adding images to that content in order to make them more visual/shareable on the web.
Good images cost money however. Sites like Shutterstock charge you. But there a a number of places to get free images. I just learned about Reshot which allows aspiring photographers to upload their images which anyone can use for free without any licensing restrictions.
Pexels is another one.
Unsplash is my 3rd pick.
