This is a demo of how you can enter a blog post as often as you wish, even several times a day, if you have that much time on your hands!  But, realistically, most of us won't want to do anything like that.  Maybe once a week might be enough so that our friends and family can quickly catch up on our activities and interests.

A blog here on Blogger can have images, like this:

Or it can have videos, but I am still trying to figure out how to make that work.