Like
@RainPilot , I use primary donate. Classic long hose, bungeed backup setup. I would, however, be just a tiny bit careful about going that route unless you're prepared to learn proper drills. Also, be aware that those you'll be buddying up with, may not be familiar with a primary donate system. After all, secondary donate is the standard procedure taught in beginner training by all the major agencies. So, you have to brief them properly during the pre-dive chat, and make sure they have properly understood how you'll donate if necessary.
What is the best way for me as a beginner?
I'd seriously consider setting up your regs the way you were taught in OW class. Later, when you have more experience, you can make a more informed decision about whether primary or secondary donate is best for you.
With secondary take, usually the backup is attached to a d-ring on right chest by some kind of quick release, there are a bunch of types available. Im not a fan of these as they are designed to release easily and will whether you want them to or not. I always end up tucking guys octos back into place when I see them ploughing the reef with no idea it's loose.
I really dislike secondary take, since that removes the responsibility every diver has towards their buddy. Secondary donate is AFAIK the method taught by most agencies. Secondary take is always a backup option to secondary donate if the person donating gas isn't as alert as they should be, secondary donate isn't as well suited as a backup since the person donating gas then has to realize that their buddy isn't taking the reg.
And on the dangling octo issue: both my sons use a standard short hose secondary donate system. Their regs never drag the bottom or dangle. They use either
this octo holder clipped to the right chest D-ring, or they just use the right chest D-ring. In both cases, the octo hose is bent 180 degrees, and the bend is either inserted into the holder or just tucked through the D-ring. Those octos have never come loose inadvertently.