Thanks for the input.
I looked at the plug-in you referred to. It says “adds the related posts to feed”. I do not think that will serve me in the way I want. What you are suggesting may be better, but I am keen to make it as simple as I can – I am a real beginner here. I guess that if I could just put at the end of each blog a message that says something like “If you are interested in X, why don’t you read blog J next.”
Is there a simple way to do that manually, so that clicking on J takes you to blog J. The next level of sophistication is, I think, what your suggestions offers – the links like J, etc, are maintained automatically as I expand the whole blog, and I can maintain a list of “themes” like X (it will be a short list). Am I right – am I properly understanding what your suggestion will enable?
Minor question about terminology. Is the whole thing a blog, consisting of multiple entries? Or is each entry a blog?