Tip 1. Normally, when Samus' Grappling Hook is deployed, there is a shocking amount of lag, leaving you open to enemy attacks (or even a dreaded KO.) To counter this, dash before pressing Z. Not only will it quicken how fast it is deployed, but Samus will also retract the grappling beam much faster.

Tip 2. On the Lylat System level "Corneria", on the far left ledge, if you use Samus' Grappling Hook to recover, sometimes you have to drop to the end of the grappling hook and just dangle there to avoid enemy attack. However, this leaves you vulnerable to the twin blasters on the ship. To eliminate this problem, jump down under the ship and use Samus' screw attack to land
on top of the blasters, then use her down smash attack several times. This will destroy the blasters for the duration of the match. (Note that when the blasters are destroyed, you can no longer stand on them, and you will have to either sacrifice a life, or try to get back onto the ship, which is quite difficult.)