Sorry if you have difficulty understanding the terms I used.
These terms are quite easy if you are a Buddhist and are familiar
with dharma, but for a start you may want to read up on the web
link to the article on the 3 Characteristics.
Of course Insight into ultimate reality is not obtained through
mentally understanding anything, but through Insight practise, by
observing the moment to moment reality our sensate experience
presents to us, we will eventually come to realise the 3
Characteristics, and the intrinsic luminosity, etc. Still, a basic
understand of the 3 characteristics is necessary as it is a pointer
on what to look out for, to be constantly aware of, in Buddhism
Insight practise.
If you feel that these things are still too deep... you may want to
start with other beginner books so you have a more thorough
understanding of what is Buddhism first.. before entering more
deeply into practises.