Julian, no problem. We don't post in order for you to stroke our sensitive little feelings!
I hope we did at least indicate that sometimes if astrology at the entry level "doesn't sound like you," there is more to get to that may make more sense. Students have to learn algebra before they move onto calculus.
A midpoint is basically the point between any pair of planets. If someone has Mars at 0 degrees Aries and Venus at 0 degrees Taurus, the Mars-Venus midpoint is at 15 degrees Aries. We would think of Mars and Venus as way out-of-orb, but suppose the person's moon is at 15 Aries. It will tie in Mars and Venus in ways that we wouldn't get from just looking at orbs.
Introductory astrology sources correctly stick with the major aspects (like oppositions and trines,) but you can divide the 360-degree horoscope any way you like. 360/7 gives us the septile aspects, of roughly 51, 103, and 154 degrees. 360/9 gives us the novile aspects of 40, 80, 120 (trine) and 160 degrees. And so on.
Some astrologers work with minor aspects, some don't. Those of us who do might convert them into a special kind of chart called a harmonic chart, which is basically just another way of showing planets' relationships in light of a particular aspect.
For another thread, perhaps.