Primary resources
This link takes you to the 2D kinematics sections of the openstax college physics textbook:
This video is a basic introduction to 2D kinematics via a projectile motion example:
https://www.youtube.com/watch?v=BZwizmCI_g0
Secondary Resources
This link provides a discussion about a simple case of a falling object in a 2D system:
Other Resources
Great introduction for 2-D kinematics, with a nice example problem towards the end. But beware, the notation is poor and she lists "disadvantageous" kinematic equations.
https://www.youtube.com/watch?v=p3wGLMz02Wo
2D kinematics section PDF from MIT.
http://web.mit.edu/8.01t/www/materials/modules/chapter05.pdf
Freefall: Horizontally Released Projectiles (2D-Motion)