Looking for classroom blog ideas

I am a third grade teacher and I am starting a class blog next week.

I have created different pages on my blog (math, reading, writing, science etc…). Every week I plan to post an assignment for the students.

The first assignment I thought could be for students to introduce themselves and write a few sentences about what they like or dislike about third grade.

I am looking for a website or a book where I can get ideas of what assignments to post for my students.

I would love some feedback.
Thanks