The vast majority of new growers like to use the common paper towel method, thats fine, ...it works!!
but really what is needed is a proper understanding of what is actually happening in the seed, bottom line is with fresh seeds, under 5 years old, water and temperature is used to stimulate the radicle which emerges from the seed shell, as the perianth extends, so does the cotyledons, and shoot apex, once the plant is about 1/2 an inch the root cap is very prominent, and searches down for the soil to sink into ..easy!!
Many guys who are comfortable with their own DIY seeds prefer to drop straight to soil, as these home made seeds are no more than 2-3 years old at best and as such highly fertile, but should you be buying seeds from half a world away from some very dodgy bastards indeed who call themselves breeders and even the more dodgy seed agents and banks, you just never know what you are gonna get, hence the paper towel method is a great method of quarantining your samples before actually inserting to your medium, in other words soaking in towels you can actually see if your seeds are viable or not.(noobies are very tempted to fuck around with the shell here this is to be prevented at all costs)
If you are new or very cautious you may go as far as adding a teaspoon of bleach to a glass of water, allow the seeds to soak overnite at 70f and in the morning to the damp paper towels, and place to a plate then on top of my modem, the bleach knocking of anything like fungi spores(damping off) or TMV?...and or a host of other bugs that attach themselves to seed kernels, I've been told that adding bleach also makes it highly female too, tho I cannot prove this, and doubt its viability
Stratification or roughing up the outer shell of the seed to allow water to penetrate, I've only had to do 2-3 times with very old or precious seeds, to make certain that water has soaked thru the seed itself, with care here as it can cause more damage than its worth
I prefer to store my seeds in a jar of rice in the freezer, best to use in under 5 years