How to Change Modes in Emacs

Emacs displays the current mode in the mode line at the bottom of the window. If C-x C-s isn’t working, you might be in a special mode where those keybindings are different. Here’s what you can do:

Check the Mode Line: Look at the bottom of the Emacs window—it’s where your active modes are listed. The major mode (e.g., Fundamental, Text, Org, Python) appears on the left, followed by any enabled minor modes.
Press C-h m: This will show all active modes and their keybindings, helping you understand why certain shortcuts aren’t behaving as expected.
Try M-x normal-mode: If keybindings feel off, running M-x normal-mode can reset the buffer to the default mode for your file type.
Escape Key Issue: Hitting Esc once in Emacs simply acts as a Meta key. If you’re stuck in an unfamiliar mode, try C-g to cancel ongoing commands.

If C-x C-s is completely unresponsive, consider checking if you’re in a special minor mode that intercepts keybindings (like overwrite-mode). Let me know if you need more debugging tips.