Moving Your iTunes Media To an External Drive

You closed the comments to an old post MacMost Now 631: Moving Your iTunes Media To an External Drive.
Does that video still apply to MacOS Mojave and latest iTunes (12.9.whatever)?
Or would you recommend a new improved way of doing this?
Only asking because that post and comments are 6 to 7 years old and things can change a lot with computers/software/apps in that time.
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Eric