I've been practicing key positions for some days now. I feel like I internalized them well enough, and ready to move on.

Did more research on steno. Most important terminologies I found:
Writing - common term, basically same as "typing" but used for stenography.
Chord - loosely corresponds to a syllable you type in any given word.
Theory - the overall principles you adhere to when writing on a steno keyboard.
Writing long (or long theory) - means writing phonetically, based on syllable sounds for example writing "WHOZ" for "whose", it makes it easier to remember, but impacts speed quite a lot, because the amount of chords you type tends to be similar to the amount of syllables in the original word.
Writing short (or short theory) - means relaying more on memory and heavy utilization of custom briefs, for example REFP for "representative", it makes it harder to remember, but for long words greatly increases speed.
Stroke - complete sequence of depressing and releasing a number of keys to produce the needed output.
Brief - representation of a word or a phrase mapped to a specific key combination in a dictionary, can be phonetic or seemingly random.
Dictionary - the total set of all briefs for words and phrases. Can be general in nature, or be specific, for example a Financial dictionary, containing briefs for financial words and terminologies. You can have multiple dictionaries active at the same time, plus each word can have multiple ways of writing it, as long as these ways are not in conflict with each other.
Conflict - when you have a conflict of the same strokes/words in a dictionary, happens when you migrate/combine different theories. Or make your own changes to the dictionary.
Real time - writing in real time (usually real time speech is around 180-230 WPM). 225 WPM at 95% accuracy is the graduation speed for many stenography schools.

Some additional info and my thoughts:
In steno unlike regular typing you can position all your fingers to the needed places at the same time, thus, the process of "typing out" a word with your fingers is not sequential but parallel, yet, this process of positioning fingers is not instant and takes time and mental energy, Therefore the less chords you have to type the faster you can be, that's why writing short or having short theory is so valuable in this field. But some steno schools aren't even teaching real time theories (which in practice means that their students have no chance of graduating regardless of their practice, ability to remember things or follow the curriculum. (In fact the drop out rate is something like 85% in most cases), so you can pay $20K tuition, $5K hardware 3-5 years of your life, and get basically nothing in return. This is so disgusting, my only hope is that any person with 2 brain cells would research the topic, like I did, and in case the theory is not suited him/her would ask for refund immediately, or file a lawsuit.

Total combinations - in steno you can type 2^22 (4,194,304) of possible combinations, even if you take very unrealistic figure of 300,000 total words in English language, you still will have many 'placeholders' left to fill with anything you desire, HEX color codes, emoji, function templates, long passphrases(actually no, just as a thought), macros, signatures, common replies for support role, timestamps, shortcuts or almost anything else you can imagine.

In steno there in no such thing as THE way of writing something, each stenography school teaches one of many theories, and each stenographer has his/her own dictionary by the time he/she graduates. The dictionary will also heavily reflect the field in which the stenographer operates, court stenographer may never type "C#" in his/her entire carrier.

Because of such diversity and lack of standardization, it is very difficult for a newcomer to pick "an optimal" way of learning stenography or to choose the theory one likes the most. For example I would rather prefer to study a short theory from the very beginning, but all short theories are not free, dictionaries are not shared anywhere, they kept secret behind the closed doors of these so called "school" i.e. scam institutions. Original Plover theory is built on top of StenEd by Mirabai Knight and as far as I can tell doesn't look short at all. There are one project which tries to change that and bring short writing to Plover, the "ROPE" system, it's basically one's guy dictionary shared with the community, It might be a good starting point for your own custom short dictionary.

My further plan is to read these three online books:
https://www.artofchording.com/introducti...works.html
http://www.qwertysteno.com/Home/
https://sites.google.com/site/learnplover/home
Without concentrating on exercises that much, and then go to
https://didoesdigital.com/project/typey-type/
and basically start the proper grind journey...