What is the “valley of despair”?

Have you ever done something new and are extremely excited and happy about doing it? The term “Valley of Despair” is targeted towards the feeling when something new is difficult and something you can’t understand and for the moment you only see the bad things about the new thing unlike before. It’s like when you’re introduced to a new game and at the start, you like the game, but the gameplay is complicated. So, you start getting angry about the game. Once you get over your anger and annoyance you will get used to what seemed horrible and start enjoying the new thing again.