The way....what is the shortest way to the correct information

how do programers get access to the correct information without having to ask, like what is the way, Let me give an example, in order to use postgres in Django application, You will have to install something called psycopg2, but in Django-postgres documentation https://docs.djangoproject.com/en/3.1/ref/contrib/postgres/ Theres no such thing as "getting started", theres no mention of psycopg2 at all, u will just have to spend a lot time to google it or watch a video, and if google doesn't have the answer or you just didn't search it correctly, you are stuck, And this is only an example, i have encountered many of these situations, and it's so frustrating, I mean i didn't write postgres and i didn't write django either, i don't know how it works unless someone told me, it doesn't feel like im in control, it's not like a math problem or algorithm where you just have to solve it on your own, but you are in control, The problem is some basic information is just too hard to find in the documentation, the way i do it doesn't seem right, Is everyone else doing it like this? or is there a "smart way" to find it? or a smart way to read the docs?