This forum is quite active, and if a thread is not updated at least daily, then it will soon slip out of sight.
The forum is divided into topics. When you start a new thread you need to say whether the thread is about Plants/Problem Solving/Fruit&veg/Wildlife/Design/Tools/etc.
And you can see all of the posts about any of those individual topics.
Maybe, if you ask the management nicely, you might be able to get a topic called RHS Courses, so that anyone could easily find all of your own threads.