Yes that can be included. The problems may range from very broad stuff, like exchanging states like you mentioned, or testing, or an architecture and even narrower ones like how to do form validation easily (problems can actually be argued upon to be narrower or broader ones I believe). But solution has to be very specific so that someone who is having that problem actually finds solution helpful and understandable. It should contain resources so that he/she, in most cases will not have to look beyond these resources when practically approaching the problem. You can also include multiple solutions and tutorials links, etc. to those.
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Yes that can be included. The problems may range from very broad stuff, like exchanging states like you mentioned, or testing, or an architecture and even narrower ones like how to do form validation easily (problems can actually be argued upon to be narrower or broader ones I believe). But solution has to be very specific so that someone who is having that problem actually finds solution helpful and understandable. It should contain resources so that he/she, in most cases will not have to look beyond these resources when practically approaching the problem. You can also include multiple solutions and tutorials links, etc. to those.