What's your question? Ask

These articles should be helpful:
https://www.gardeningknowhow.com/edible/vegetables/asparagus/planting-asparagus-how-to-make-an-asparagus-bed.htm
https://www.gardeningknowhow.com/edible/vegetables/asparagus/transplanting-asparagus-plants-tips-for-how-to-transplant-asparagus.htm

Salt affects all plants, so while it will kill the weeds, it won't help your asparagus very much. Generally, weeds need to be controlled before the asparagus sprouts. This article will help:
https://www.gardeningknowhow.com/edible/vegetables/asparagus/salt-on-asparagus-weeds.htm

You can cut them back in the fall. The foliage should not be cut till after it turns yellow, but once it turns yellow, it is dead and is of no further use to the plant so can be cut back, even if the plant is young.

If they are established (older than 3 years) and planted to the proper depth, you can till shallowly up to 2 times a year. Before the spring growth appears and then after the season is over are both appropriate for tilling asparagus.

Any time you transplant any plant in summer, the key to survival is water. make sure that you water them frequently for several weeks after you transplant them.

This article will also help:
https://www.gardeningknowhow.com/edible/vegetables/asparagus/transplanting-asparagus-plants-tips-for-how-to-transplant-asparagus.htm