I think for new bloggers that have not been blogging for a long time should just write what they think. I think that because when I first started I started saying to myself don't write a list of things I did write what I did and why. A good blog post should also have good punctuation by putting full stops, commas and not over using explanation marks. I think that a good subject you should write about is subjects you liked and thought were interesting. You could also write about things you do outside of school and why you enjoy them. If it is your first time blogging you should visit some other more experienced writers and learn from their blogs. If you don't know any people's blogs you can read, read your teachers or someone that is famous maybe because some famous people have blogs.
I have been in a blogging competition and have been sick for a pretty long time I'm really disappointed because I was to sick to even write blog posts! I'm sorry I haven't been blogging for a while and I will try and get back into the habit of blogging regularly.