I am new to Neovim and using the default terminal in Ubuntu for Neovim.
With the default terminal, we can click the right mouse and get the options for cut, copy and paste.
How can I get this type of functionality in Neovim?
First, you must enable mouse support with
In GVim you also need to
:set mousemodel=popup to activate builtin popup menu.
In Neovim it all depends on GUI frontend, as Neovim itself has no GUI code builtin. So you should consult the help system of relevant frontend to know if you have to do something or if that's possible at all.
However, as @statox mentioned in a comment above, in Vim/Neovim the major part of editing actions should be done mouseless. Of course, this is not an absolute strict rule, but, at least the most frequent ones, such as copy/paste, really belong to your keyboard. I encourage you to give this a try, even if it is a paradigm-shift.