Smash as a series has always been a very technical, high-execution fighter. This can make it a bit hard for newer players to pick up the game and get into the action. Luckily, Super Smash Academy exists, and they’re devoted to breaking down potentially confusing and complex mechanics for anyone to easily pick up.
In their most recent video, they talk about Powershielding, a technique similar to Parrying in Street Fighter III. The folks at Super Smash Academy dissect this technique and its applications across all of the Smash titles, while also offering a look at the difference it can make in some specific matchups.
On their channel other helpful videos can be found, such as a breakdown of Ledge Gaurding and Wave Dashing.
Source: Super Smash Academy