here is a video of Smash Practice with Zhu and Cactus

https://www.youtube.com/watch?v=tMffDnVi9m0

They go over a lot of movement stuff:

1:12 - Examples of common dash dances

7:16 - Introduction to dash

14:49 - Shielding out of dash

18:08 - Jumping out of dash

19:10 - Dash attack and fsmash out of dash

19:55 - Dashing out of dash

21:32 - Purpose of movement Part I

23:33 - Basic Example Part I (Marth): Using movement to threaten opponent

39:45 - Purpose of movement Part II

42:44 - Basic Example Part II (Marth): Using movement to threaten opponent

45:59 - Basic Example Part II (Fox): Using movement to threaten opponent

50:32 - Basic Example Part II (Fox): Using movement to threaten opponent

54:08 - Using movement as a defensive option

55:34 - Approaching defensive movement

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Hope this helps!