The teachings of the Buddha are summaried in the Maha Satipatthana Sutta. Many great translations exist. There no need to repeat what is already translated. However, the Buddhist practice is a living, growing, fertile way of life. Everyone who dives deep finds their own uniqueness. Is this a contradiction of the doctrine of no self, anatta? The paths to the heart of our existence are as varied as DNA. In mathematics there are an infinite number of irrational numbers, infinitely & uniquely nonrepetitive. The characteristics of liberation can be summarized but as each person finds their way, what they actually find is as unique as their DNA, as varied as one irrational number is to another.

There are 7 factors of enlightenment: mindfulness, effort/energy, concentration, investigation, rapture, tranquallity and equanimity. First, what is meant by factor? In my case, I see the practice as a fractal that simply goes on getting deeper & more finely detailed forever. The deeping process requires discipline & results in qualitative experiences. Mindfulness, effort/energy & concentration constitute the discipline. Investigation, rapture, tranquillity & equaninity are qualitative experiences of a steady practice. The discipline must have direction. The qualitative experiences are natural byproduct, however, reaching for a qualitative experience directly never worked for me.

So factors for me are grouped into the discipline & reinforcing qualities of a steady practice. Please notice that the reinforcing qualities are synonomous with characteristics of the formal jhanas, see In This Very Life by Sayadaw U Pandita, pgs 180-190. (You will notice as you study the Buddhist literature that themes are repeated in various groupings: 8 fold path, five spiritual faculties, etc. -- all have mindfulness, effort/energy & concentration with various adjectives. Under concentration the jhanic characteristics are repeated with slight variations.)