We can find Abhidhamma in the Suttas too, e.g. see A Discourse on the Cūlavedalla Sutta.
Its normal for any advanced field of knowledge to have its own technical terms. To the uninitiated, it may seem like just so much jargon, but if you want to be precise, it cannot be avoided.
Pali terms come with the territory when studying the Buddha's teachings. Although you can read all of the Suttas in English translations, unless you know the original Pali terms used you may lose some or most of the meaning, depending on the skill of the translator. A single Pali term like Citta or Sankhārā can have different meanings in different contexts, so we cannot always translate them with the same English words. The English words "consciousness" or "mental formations" may also mean different things to different readers.
There's even more room for error in a talk. I remember one talk by Ajahn Amaro where he was talking about just knowing the seen in the seen. One member of the audience thought he meant "knowing the scene in the scene."
Be patient, and don't try to run before you can walk. If some suttas are beyond your current level of understanding, then read others. Practice meditation more, and question different teachers face to face if possible.
Thank you Bhante.
Is abhidhamma necessary to attain Stream-enter? As I read, I see a some people don't have the ability to remember the sutta the budha taught, or can't bear the complexity of the Vinaya, they seem to just need to practice, and not likely I think they can learn abhidhamma, yet they attain Arahat.
Is it need jhana to begin learning abhidhamma ?
Can we "check" abhidhamma ? You know, like when the Buddha said breathing meditation can help you overcome sadness, grief,grow concentration,.... You can just sit, and later can check if the buddha said is truth or not...