How should I learn a foreign language?

The ideal way
The most efficient form of language learning is to spend all your time and energy on it, undisturbed from morning till evening.

The reality
Most people have to work and run their household chores and thus become tired by the evening. Sometimes they don't even have enough time for their own family. There is not a lot of time for learning but it would be great to be able to speak a foreign language.

The solution
It is possible to learn in a way that makes You happy and ensures success.