This video is a bit older now (over one year), but I just found about it. And I want to share it here, because it was very well explained, without boring stock videos or background music. It's just like a teacher would teach you, but with some enthusiasm behind it. I enjoy his videos so far.

• Watch on YouTube: https://youtu.be/Zkv8sW6y3sY
• Watch on Invidious, a more private and indirect way to watch: https://inv.nadeko.net/watch?v=Zkv8sW6y3sY

Video description:

Why is the speed of light the same in all reference frames? Let's rediscover the thought experiments that led Einstein to his special theory of relativity

Chapters:

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00:00 Introduction
01:15 1/3 Detect motion with particles? (Thought experiment)
04:01 Inertia doesn't allow detecting constant velocity motion
06:18  2/3 Detect motion with waves? (Thought experiment) 
09:18 Medium doesn't allow detecting constant velocity motion
10:15 Constant velocity motion is RELATIVE!
11:02 3/3 Detect motion with light? (Thought 
  

Tracklist:

[00:12] Andromedik ft. Ayah Marar - Tomorrow
w/ Sub Focus - Solar System
[03:11] Andromedik ft. MC Stretch - To The Dark
[04:20] Marlon Hoffstadt aka DJ Daddy Trance - It's That Time (Dimension Remix)
[05:57] Andromedik & Used - Take Me
[07:25] Mason vs. Princess Superstar - Perfect (Exceeder) (1991 Remix)
[09:13] Grafix - ID
[09:58] DJ Daddy Trance - I Got You (Andromedik Bootleg)
[11:50] System F ft. Saskia Lie-Atjam - Cry (Circadian Remix)
w/ Dom Dolla - Saving Up (Bala Bootleg)
[13:38] Andromedik ft. RIENK - I See You (Used Edit)
[14:47] Sub Focus & Dimension ft. Jo Hill - Ready To Fly
[16:33] Metrik ft. Reija Lee - Cadence (VIP)
[17:19] Mau P - Gimme That Bounce (ÆON:MODE Flip)
[18:18] Andromedik - ID
[20:06] 1991 ft. Alex Hosking - Jungle (Colin Hennerz Remix)
[21:50] Eric Prydz - Nopus (The Prototypes Bootpus Mix)
w/ Sigma - Nobody To Love (Acappella)
[23:18] Alesso & John Newman - Call Your Name (Andromedik Remi