It's a link to the book sold on amazon "How to be Selfish (And other uncomfortable advice)." that helps people to learn "How to be (good) Selfish". It explains, that if you do not look after your body and your mind, you are no good to anyone. The book also has supporting exercises.
Tekgia offers very good software prices for schools and charitable organisations such as Churches, registered charities, Freemason Lodges, Girl Guides, Scout Groups, Rotary Clubs, and the Women's Institute.
Tekgia is located in Manchester. They mostly deliver to customers in the UK, occassionally overseas to Europe.
Knowledgeable in software licenses, they can give good advice. What is more they try not to overwhelm the customer with jargon.
They know that too much jargon and too much bloated marketing blurb is not a pleasant experience. That you end up feeling wiped out and none the wiser.
That is not their game. They prefer to write in plain English. So that you can make an informed decision.