Why are my yellow squash molding? Also why are they really bumpy?
Many varieties of yellow squash are just naturally bumpy. This is normal.
The reason for the molding varies. I am assuming that it is molding on the plant. If this is the case, it is likely that the flower was either not pollinated or under pollinated. This results in the fruit dying before it grows to full size. If it does not detach from the plant properly, then it would start to rot and mold on the plant.
The other cause may be damage to the fruit allowed rot to get into the fruit. Skin damage can be cause by animals in the garden or even rough winds knocking it around.
I'm planting yellow crookneck squash and have read several articles that advise planting them in hills. How big is a hill? Mountain or mole hill? No one specifies -- can you help?
After the soil is well tilled, create hills or mounds of dirt about 12 inches across and 3-4 inches high.
What fertilizer should we use for yellow squash blossom end rot?
You can simply use a high calcium fertilizer. This article should help too: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm
What fertilizer do you use after blossom end rot starts?
Use something high in calcium. This article will help: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm
I had planted from seed some yellow squash in February successfully according to my zone. The amount of days until plant bared vegetable was successful. I planted it in a container and saw over 40 flowers and soon had my first yellow squash. After harvesting the first vegetable, the leaves started to wilt and my flowers never produced but 3 more squash. What did I do wrong?
This is typical behavior for curbit plants (squash, cucumber, melon). They will produce mostly male (non-fruiting) blossoms early in the season and will gradually start to produce more female blossoms as the season progresses. Give it some time and you will see it start fruiting. Here is how to tell a male from a female blossom: https://www.gardeningknowhow.com/edible/vegetables/squash/female-male-squash-blossoms.htm
This could also be a problem with poor pollination. You may need to lend a hand. The following article should help you: https://www.gardeningknowhow.com/edible/vegetables/squash/pollinate-squash-by-hand.htm
I planted the crookneck last year, but this year I have both kinds. Before I planted the staightneck, I wanted to make sure it will taste basically the same, and that the only difference is the looks.
Yes, this is correct. The flavor is about the same, they just look a little different.
I planted yellow squash in my raised garden and the plants are beautiful, but when the squash are about 2-3 inches long, they start to shrivel and drop off. Sometimes there is a purplish spot at the end of them. What can I do to get them to grow to maturity?
These articles will help: https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm