g+t and g+T are Vim's shortcuts to jump to next & previous tabs.
You can use <C-Tab> and <C-S-Tab> to map within Vim but you'll probably need to help your terminal produce correct key codes. Depending on your terminal,
urxvt, add to your .Xresources file:
URxvt*keysym.C-Tab: \033[27;5;9~
URxvt*keysym.C-S-Tab: \033[27;6;9~
Alacritty, under key_bindings, add following to your ~/.config/alacritty/alacritty.yml:
- { key: Tab, mods: Control, chars: "\x1b[27;5;9~" }
- { key: Tab, mods: Control|Shift, chars: "\x1b[27;6;9~" }