If you collect sewing machines, one of the issues you may have discovered is that each machine has it's own unique way of doing things. My machines cover a wide range of production years, and are made by many different companies that have completely different mechanics.
It is challenging to remember how to wind each type of bobbin and then correctly place the bobbin into the bobbin casing or into the machine if there is no case. Each of my machines take a different kind of bobbin and here are four different ones from the machines I use regularly. The long bobbin is from my Singer treadle (vibrating shuttle), below that is the Featherweight bobbin and case, bottom left is the Brother bobbins, and top left are the Janome Gem bobbins which don't need a case and drop right into the machine.
Each machine uses a different bobbin winding procedure, and the bobbin is placed with the thread coming off the bobbin in either a clockwise or counterclockwise fashion. The machine will not sew if you don't do all of this the proper way!
This is how I deal with the technical confusion...
I photocopy the page from the owner's manual that tells me what I need to remember. Then I laminated these instructions and cut it to the approximate size of a playing card. I keep the card with the machine it belongs to. Here is my Blue White (Japanese Clone) instruction card telling me how to insert the bobbin into the case. I can always remember on this machine how to wind the bobbin because it's visible and easy. But I can never remember which way the thread should come off the bobbin before I put it into the bobbin case.
Here is my Sweet Baby Jayne Featherweight card telling me how to correctly insert the bobbin (which is opposite to the Blue White).
I always have the information handy when I need to rewind the bobbin, without having to search for the manual and try to locate the information within the manual.
Easy peasy and you're ready to sew on any machine at any time! A person could also solve this problem by only having one machine, but what fun would that be?!?!