additionally in regards to --
" 4) when certain seeds are recommended to "press lightly into the soil" what is meant is for you to just throw the seed on the ground & not bury it at all. This is most common for wildflowers. Nature will take care of the rest, albeit you're leaving things entirely to chance as to whether they will be eaten before they can sprout. The specific germination instruction was given under the assumption that you are a trained botonist or garden specialist & are growing these plants in a controlled environment &/ or for transplanting/ resale. "
yes it is very difficult to sow these types of seeds directly in place...this is also known as "sow under glass" and can sometimes be written that way, or also "surface sow". it does definitely work best to start these types in controlled environments, with proper seed starting type fine "soil" nonsoil...really its best in nonsoil...coco coir or a peaty type fine mix. when you do this inside its best to wet the medium completely BEFORE you plant the seeds, either mist or use a humidity dome....or at least be regularly babying them with extra watering and making sure you have that kind of moist environment.
it is definitely possible to sow these outside directly -but with some care in timing it with light rains (too heavy rains will carry them and wash them away or bury them, or interfere with them when they are tiny sprouts)...and also on nicely prepped up soil...enriched or fine soil, rather than just throw them any old spot with competing weeds/low
organic matter content/compacted soils.
some have to be done this way, and direct carrots come to mind, you cant really transplant carrots and its very tricky to time it with good light rains or frequent light misting waterings.... and they are a surface sow type seed. the trick is in keeping the top of the soil sufficiently moist, not too wet, not too dry, when that top surface layer of the soil likes to dry out so much quicker.
strawberry, chamomile, carrots, sage, tobacco varieties, most berry types, are some in this group and also they are "positively photoblastic" meaning they need light to germinate. there are several ways to work around this. one is to soak in a bowl of water, under saran wrap or wrapped in a clear plastic baggie, in a bright sunny spot inside on a window...you may or may not change the water a few times, but generally just wait, use clear glass like jars or glass bowls....and they will sprout right on top of the water.
with other stuff like wildflowers, chamomile, and again back to carrots -- the best way may be ooddles and oddles and epic amount of seed broadcast. whenever you direct sow like this it is good to throw down at least ten times more seed than you would start inside in controlled conditions.