It seems to be someone's website selling books with catchy titles of the 'teach yourself not to feel guilt, shame, etc' variety. And some links to therapists' websites.
There are thousands of books written every year telling us how to live our lives to be happier, richer, more fulfilled etc. I have read a few over the decades. Most are either common sense, or a pile of appealing seeming platitudes and anecdotes. A few gave me interesting insights, some were mildly interesting, most were patronising or forgettable, some left me feeling temporarily even more inadequate.
I wonder why someone would advise to use the website. I think I would ask them why they advised it, and in what way it had helped them, and why they thought it was relevant to you - and whether they have a financial interest in it.