To publish a blog post, you need to write it, edit it, preview it, publish it, and update it later. Admit it, most blogging software has bad publishing experience. What is wrong with those software for example Wordpress about writing blog post? Everything!
See why not Wordpress Why programmers should not blogging with Wordpress
The only difference between repeat and repeatedly is thing they repeat, first one repeat value, second one repeat function evaluation. Actually we can build repeatedly based on repeat as below.
So we don't need to remember both of them, you just learn one and deduce the other one.