Just switch to visual mode and select the text and yank it.
Press v where you want to start the selection from (switches to visual mode), hjkl (or arrow keys) to move the cursor to the end, then you can yank it from there. It’ll highlight what you’re selecting just like you’re using your mouse, but you’re using the keyboard.
If you want to get really fancy there are 3 different kinds of visual mode, but lower case is the most often one that I use because it’s char by char, V is line by line, Ctrl+v is “block” (you can select chunks across several lines omitting things at the beginning or end of lines).
Ctrl+V to do the block mode is nice if you need to edit the same part of several lines that all line up vertically, you just Ctrl+v, jk to select the lines, then I (shift+i) to insert on all those lines (if you’re in vim you can delete things in insert mode also, if you’re in vi you’ll need to delete first then insert)
The proxmox interface let’s you make the containers, but you have to install the software you want to host in that container after creation.
These scripts let you run a script that makes the container and also installs what you want to host within the container and does the setup.
I used their script to set up a home assistant vm, you run the script and it downloads the HaOS install media and does the install in the VM for you, preconfigured, and starts it so all I had to do was go access the web interface.