I am glad to hear that, Lvalio!
It is a good idea for all to understand those posts, at least the first two.
For example, the moment after we see something, it goes to our memory. Same with a sound that we hear. We hear it and it is gone (except that it is registered in the memory.) Same for smells, tastes, and bodily touches.
– Thus, rupakkhandha is almost all memories.
Of course, there are rupa out there in the external world.
– But rupakkhandha is what each person has seen, heard, smelled, tasted, or touched.
– So, there is a difference between rupa (which are sankata) and rupakkhandha (which is what each person has experienced.)
Think about that!
The other four (vedanakkhandha, sannakkhandha, sankharakkhandha, vinnanakkhandha) are easier to see.
– Thus the five aggregates are all mental.