As I'm going through the Appian Developer course I have noticed that some information is missing when trying to pass the quizzes. I am completely stuck on Expressions. Is there something else I should be doing besides the Developer course?
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Probably yes. Maybe you want to elaborate on what information you miss and what makes you feel stuck.
The courses are well designed as per my understanding .. but if you feel that is not enough its always best to have a look at the docs.appian.com > quick links, there you will find everything you need to know for becoming a developer.