Adding or extending to the beginning of a track

Aloha I am very new to using audacity in hopes that I can become a voice over or do audio book s. I am in the process of trying to make a variety of samples. Somehow I deleted the beginning of my track. How can I extend it in length or place another in front of it without having to redo it.
Thank you greatly in advance.

It’s possible it is still there, just visibly shrunk down to a line via non-destructive editing … https://youtu.be/HpA138b-J9s?&t=67