One thing I can explain:
you confuse stuff. And that is normal.
The "knit stitch" that you learned, is not a knit stitch but is the "knit on cast on". That is a perfectly fine method to use (by far not the only one and not always appropriate, but here: just fine).
But let's get the terms right:
to cast on: make loops over the needle that can be knit in a row. That is your set up. Some way or another you need to create stitches before you can work them, right?
Videos for the cast on.
Once you cast on, you can knit. There are different stitches to make, but basically you make knit stitches and purl stitches. (most of the rest is variations in knitting)
There a 2 major schools of knitting. The one in that blog you linked is called "English knitting". This site has viedos for Continental (the other method) and English. You want to click on the blue buttons for the videos (not the pink ones)
The knit stitch: one basic stitch in knitting.
Video for knit stitch
The purl stitch: the opposite stitch, pretty much.
video for the purl stitch
you will get to see that a knit stitch is like a purl stitch in reverse and vice versa, but for now, try not to understand that magic but to follow the instructions.
the last step of a project is the bind-off (you need to secure the stitches at the end, you can not just leave those loops in mid air).
videos for bind off
And with this you can make your project work. Have fun.
Very useful for beginners: Watch the first video in this section: Demo of a small project
That shows a mini-piece from A to Z.
I hope you will enjoy your new hobby.
I really recommend reading a lot in the forum, watching all those videos, bit by bit (check out the entire video tab) and looking around. Don't be afraid to ask, we all started one day.