Don't throw out the water your boil your eggs in. This water contains tons of calcium that your plants will love. Just let the water cool and dump it on your plants. I also save my egg shells, rinse them out real well, smash them up then mix them with dirt and/or potting soil before planting any plants. For someone who doesn't have a green thumb, I have had great success with this.
Keeping squash from getting out of control. Some gardeners are afraid to grow summer squash in a small space - not me, though. Whether it's yellow crookneck or zucchini, it's only got a 2' x 2' space alotted to grow in if it wants to grow in my garden. Upside down tomato cages are used to keep the leaves from sprawling out everywhere, which is quite effective - at least in my experience. Daily attention is needed to make this happen though, as the leaves must be kept inside