Watching interviews and analyses of great dialogue writers is time well spent only if it ends in a technique you can name and apply to one page. Otherwise it is entertainment about writing, which feels like work and is not.
Pick one scene from a produced script whose dialogue you envy and transcribe two pages of it by hand or by typing. Copying forces you to notice line lengths, interruptions, and how rarely characters answer the question they were asked.
Then name exactly one technique. Examples: nobody answers a direct question in the first exchange; every scene starts mid-argument; the person with the least power speaks last; a repeated object is used as a scoreboard. One named technique, not a mood.
Apply it to one page of your own — not the whole script. Techniques absorbed on one page transfer; techniques applied wholesale produce pastiche, which readers spot instantly and score lower than plain writing.