Say goodbye to bad backgrounds

[dlightdlight]

I got the links below from an Adobe email advertizement on Jan 12, 2021 entitled "Say goodbye to bad backgrounds".  At that time, I clicked on and reviewed the links content and became very interested. I was impressed by how consise the information was.  It was exactly what I wanted.  I saved the email hoping to use the technique later.  Well, I finally got some time to try and master the technique, but, now link #2 is bad.  Does anyone know where it went ?

1.

https://adobeint-mid-prod7-m.adobe-campaign.com/nl/jsp/m.jsp?c=%40nns0ZkELRkKI0TvVKGAhr8W%2ByG1BB7yg...

2.
https://t-trg.email.adobe.com/r/?id=h4dfab77c,8e910644,849722a7&p1=5S7K85L5

PS - again, this link was very consise, that's why I liked it.  If someone can't explain their technique in under 3 minutes, then I don't want to use it.

[War Unicorn]

Since that looks like Select and Mask, there are a bunch that involve it on Adobe's official help site (example here):

https://helpx.adobe.com/photoshop/how-to/fine-tune-layer-masks.html?playlist=/services/playlist.help...