I recently found some incredibly useful videos made by a Sydney Maths teacher called Eddie Woo. These particular videos give an introduction to parametric equations for Mathematics Extension 1 students. Hopefully they’re useful to you!
If you want to continue learning about parametric equations, you can find the rest of his playlist here.
For videos on all topics from 2U, 3U and 4U Maths, you can go straight to Wootube!