Some tricks in Vim

Using Vim jump markers

Set the markers: You can set a marker by m + a letter, e.g., mj)
Clear all marks:

In normal mode, type:
```
:delmarks a-zA-Z
```
Clear just the j mark:

If you only want to remove the j mark, type:
```
:delmarks j
```
Jump to a mark you've set:

You can use either 'j or `j to jump to a specified mark.

Getting a split with copy of the text in a new buffer

The reason why this is a bit unusual is that:

:vs does not duplicate the current file or the current buffer. It simply creates a second Window (a viewport) that looks at the exact same Buffer (the text loaded in memory).
:saveas main_copy.cpp: This does two things. First, it writes the current buffer to disk as main_copy.cpp. Second, it renames the buffer itself to main_copy.cpp.

Method 1: Read Alternate File

Type :vnew (for horizontal split, use new)

This opens a vertical(horizontal) split with a brand new, empty, unnamed buffer. Because you just left your original file, Neovim quietly stores your original file as the "alternate file".
Type :0r #

:r means "read". # is the shorthand for the alternate file. The 0 tells Neovim to paste the text starting at line 0 (the very top).

Method 2: The "%" Register Trick (If you want to save the cooy immediately)

If you want to immediately create the physical copy on your hard drive (like main_copy.cpp) and open it in a split, you can use the % shorthand, which represents the current file's name.

Type :w %:r_copy.%:e

:w writes the text to a new file, but unlike :saveas, it keeps your current buffer attached to the original file.

% is your current file (e.g., main.cpp).

:r strips the extension (leaving main).

_copy adds your custom text (leaving main_copy).

.%:e grabs just the original extension (adding .cpp).
Type :vs %:r_copy.%:e

This opens a vertical split for that newly created file.