ROOT TIP DOWN. SEED UP.
ANYTHING else is some government agent or anti-drug tard lying to ruin your crop before it even comes out! Research growing without it being about weed, and you will find this to be true! The ONLY place you will find "root tip up" advice is from weed forums from people who believed other people that lied to them! You lower your chances of growing anything if you follow the advice of taproot-up!
Seeds don't even need to be buried to grow in the wild. They get wet, the pressure from that infuses the insides of the seed with hydration and pops it, it starts growing inside, sucking in water, busting out of that shell, and in the wild, if not buried, tries to poke itself down into the ground. Many trees with large seeds that have no time to be lost in the soil are born this way! That's why some trees have insane looking root bottoms which are all exposed and stuff, aside from those showing that way just from erosion or whatever =)
My current grow, I thought was failing, so I DUG THEM UP and then I thought they were failing again, so I dug them up again and they were double long, so I buried them again.
You only need to make a 1/4 to 1/2 inch hole, the seed can literally still be above the dirt as long as that taproot is down in it, you just made its life easier. After germing, if you plant it upside down, you just add to the difficulty. Maybe it will make a stronger plant (of those that survive!!!) but I wouldn't do it unless I was starting 100 seeds in a field... If you're starting 2 to 10 plants or whatever, do that shit tip down
One of my current plants was buried with the seed still showing after the second dig up. That ended up my most vigorous of the two, one week into flowering after 1 month veg from seed and I have hairs, females, great growth, and this from seeds that were germinated in a small jar with wet paper towel -> did NOT wait until taproot, JUST until I saw white just beginning to pop, like a pimple on the tip under the seed lol. -> Planted that downward -> dug them up TWICE (rather abusively, too, imo, even though I was trying to be careful) after the second time they were about 2 inches long, 1 inch the first time, and they still survived and made some awesome looking females which have been very happy since birth.
I am growing in soil that was 4 years old and got wet and all the pellets in it are full of water or already emptied into the soil etc, mixed with some dry ass cactus soil. And even through all of this, I got some bad ass females that are THRIVING!
Nutes are plain old blue shit from expert gardener brand npk 15-30-15 and fed them bitches from their first set of leaves and continue to, though I think I might get some nutes with less N, even though these are for fruiting/blooming plants, I still think it will be too much N for the whole rest of flowering.
Anyway, root down, seed up, doesn't even have to be fully buried unless it doesn't have a tap yet. the easier you make it for that think to lift up its head inside the helmet of a seed, the better. That's my two cents.