How to efficiently switch between several terminal windows using the keyboard?
In linux almost every terminal support tab, for example in Ubuntu with default terminal you can press:
Ctrl + Shift + T or click File / Open Tab
and you can switch between them using Alt + $ {tab_number} (*eg. Alt + 1)
also you might want to take a look at terminator
You can use Alt+tilde (tilde = Grave) to switch between windows of the current application. Note that tilde is always the key above tab, it is a tilde in an US english keyboard, but it can be anything in other languages.
If you press the Windows key for a while unity will show you all it's keyboard shortcuts in an overlay:
Finally, near all terminal applications support tabs. The default one in Ubuntu does.
Have you Tried to open multiple terminals using:
Ctrl + Shift + T
Then switching among them using:
Ctrl + PageUP
And
Ctrl + PageDown
I usually use this scenario at least for me