Learning Klingon is so much fun. It is really hard though. I started it and I could not stop.
In some ways Klingon is actually an easy language, but it is very different from English and that makes it difficult to learn. You have to teach your brain to understand language in completely new ways.
Many users do not even know that there are Tips & Notes that explain the difference and help make things easier. If you are trying to do the course without reading the Tips & Notes, that will be very hard, indeed!
Duolingo has hidden the Tips & Notes so I want to make sure you know about them and where to find them. If you have not been reading the Tips & Notes, I would like to ask that you review those.
If you are doing the course on iOS or Android, you cannot currently access the Tips & Notes through the app. To access the Tips & Notes, you will have to access the course using a web browser at https://www.duolingo.com/. You can still do it on your mobile device, but you will have to use the web browser instead of the app (or you can do it from a computer). When you click on a Skill, it will expand to reveal a large Start button, a small key button, and a large Tips button (or a small light bulb button - the small light bulb button is pictured here).
If you click on the Tips button (or the light bulb if you have that instead) it will reveal the Tips & Notes and give you a detailed explanation of the grammar that is introduced in that Skill. If you have questions after reading the Tips & Notes for any Skills, we are happy to answer your questions, but many of your questions will probably already be answered in the Tips & Notes.