You have a number of options to find out about composites and profiles:
1) Use the F1 key. Graphisoft has numerous free videos and help articles.
2) Go to Youtube and type "archicad composites." You will get numerous videos.
3) Get some online training, such as Eric Bobrow's courses, or Learn Virtual's. Well worth the money.
4) Get some guidance from a live trainer, such as ArchiBOOST:
http://www.bim6x.com/archiboost
Richard
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Richard Morrison, Architect-Interior Designer
AC26 (since AC6.0), Win10