These are all very pertinent questions that require multiple approaches.
Articulate your questions carefully. Contemplate the terms used and their meanings in different fields of expertise. For instance, in linguistics those who study animals are quite happy to call what bees do a 'language' but others focused in other areas of linguistics are not. It is an arduous task sifting through the detritus of words and it is necessary to make mistakes.
What I think you may just be beginning to understand (or rather understand more fully) here is that every word you type can mean different things to different people and that this then becomes exponentially more likely once these words are put in sentences, and sentences into paragraphs, and paragraphs into ...
There is a lot to focus on. Pick something and stick with it to the point where it drives you utterly insane, then switch tack and tackle the next one. Often once you have circled back around to the first thing you began to tackle it has crystalised a little and leaves you to further reexamine it AND other related ideas.
If you want to talk about Language then break that up into parts and tackle them on eat a time. If you want to tackle the concept of Intelligence, likewise.
When I asked some days ago what you hoped to get out of philosophy you said "I don't know".
If you are interested in Language I would recommend you read three books written by different people with opposing views in parallel to each other. Do not read second-hand analysis or interpretations, just read the source material -start with the Conclusions (last Chapter/Page/Paragraph) and then read the Intro. Make a comparison between them. Then read them through jumping between one then another. This should prevent you being too taken in by any one particular view over another.
I would hesitate to recommend any books because my knowledge is limited. Perhaps other can suggest THREE and look at what people suggest as three comprehensive and opposing views of this topic.
Off the top of my head I would suggest:
- The Language Instinct, Pinker (as a general introduction only).
- Any introduction to linguistics book (I have one by Anne McCabe which is alright).
Then:
- Philosophical Investigations, Wittgenstein.
- The Language and Thought of the Child, Piaget.
- Something about Language by Searle and/or Chomsky maybe?
More nuanced stuff:
- Poetics, Aristotle ALONGSIDE The Birth of Tragedy, Nietzsche. (This might be a bit too much though as it is more obscure in terms of how it relates to Language).
The gist of what I am saying is you seem serious, so do some serious work. Knuckle down rather than distract yourself with what some people online think or say. It is a place for honing a few individual nuggets or for throwing something randomly out hoping to hit something ... other than that the real understanding and progression lies in your own focused personal time and research, not loose discussions.
btw I have nothing of interest to say regarding what 'intelligence' is. You can study some neuroscience if you want and see what they have to say about it if you want. I took a passing look once, but there is nothing there for me really.