__I cannot find how to animate lines as far as position of a *single anchor point* goes (not length)

[Hugh Betcha]

I cannot find how to animate lines as far as position of a single anchor point goes (not length or overall position). There are tons of tutorials on how to animate along a path in hundreds of ways, but I'm having trouble finding out how to do something like I drew in this image (one anchor point stays in the same position throughout, while other moves/stretches)

[Mylenium · Accepted solution]

You could create Nulls linked with expressions and move those around. Otherwise: Effects --> Generate --> Beam

Mylenium

[Hugh Betcha]

Thank Mylenium! - 'Beams' is what I need to make a line with moveable points! This led me to find a good tutorial:

Tutorial 06: Beam Effect in After Effects ✔ (youtube.com)