This guide goes through the visa application process for the U.K. It applies to most people from different countries however, there may be differences in the process depending on where you reside and your nationality.
In this specific tutorial/guide, the application was done in the U.S.A. In order to make the video short, I did not go over a lot of the instructions that you will need to go through if you plan to apply for a U.K visa.
Note: I am not an immigration expert. If you have any questions, I will try to answer them but I suggest you contact an immigration attorney for the right guidance.