There are many platforms which offer an online platform for publishing your blog posts. You can choose and find many online

https://education.weebly.com/

From Commonsense Media

"You can set up accounts for up to 40 students and continuously track their progress through the site (or Chrome app). Students can build new websites using the step-by-step instructions that are intuitive and well-organized. Have students practice uploading an image and then rotate, crop, or fade its opacity; they can also choose from numerous template designs and add headers and other written content.

Because teachers create classroom accounts and control access, Weebly for Education offers a safe learning environment. There could be privacy concerns if you opt to make students' sites public, but you can choose to set privacy to classroom-only viewing when registering. You'll control the account through Weebly's teacher dashboard, and you can view recent student updates and disable sites if needed. Teachers can also accept homework assignments from students through their Weebly teacher site."