I put together a presentation about this topic for a class several years ago, so rather than "reinvent the wheel," I'll share screenshots from that presentation here:
First, what is parallelism?
You're probably thinking, "This is about as clear as mud." So, let's get down to details:
Is it starting to make sense? Here's some additional context:
The main point with parallelism is to make certain each element of your sentence equals similar elements.
So, keep walking the [parallel] line!
Keep pen to paper!
Prof. Rinehart