How much does Skype cost and how can I install it on a laptop in Windows 10?
It costs nothing and you can install it anywhere.
But Skype is pretty outdated
I would rather use Discord. You can also transmit audio / video there.
And in my opinion it sounds a lot better. With Skype my fellow human beings always had an extreme noise
Skype is preinstalled with Windows and costs nothing. I recommend Discord
Why do you recommend Discord?
Because newer, has more features and is generally more common. Nobody in my area uses Skype
Skype is superfluous these days. You can also use the Facebook video call.
The normal Skype is free and can be downloaded here for Windows 10: