Help with deleting in Emacs

Question

I want to delete everything up to the cursor or after the cursor or everything but selected text.

Answer 1

What you want sounds a pretty infrequent thing to be done, but here are a few ways to do it:

First, put cursor on start of text you want to keep. Press C-space to set mark. Then, use M-< (beginning-of-buffer) and afterwards C-w (kill-region-x). Now, everything before text is deleted.

Next, go to end of text and set mark once again with C-space. Now, go to end of buffer with M-> and once again delete everything with C-w.

This is one way to do it.

Other way is to simply copy selected text and put it into new buffer. I'll leave it to you as an exercise.