One way to help either screws and nails penetrate wood without splits is to use beeswax on the fastener. In fact, some carpenters will drill a hole in the end of a wood hammer handle to fill it with beeswax. An alternative is to buy a wax seal for a toilet. It's made of beeswax processed to stay soft, and costs much less.
Gas or electric yard trimmers, which is right for you? The answer is determined by what size yard you have. Electric trimmers are easier to maintain, but are limited to the length of an extension cord. Gas powered models have engines that must be fueled and properly maintained. However they will provide greater power that can be used without boundaries.