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this one is really hard to answer ... but i can tell you my secret when i start using autocad ... or any other software ... never learn those software as commands and tricks and basic or what so ever ... its gonna give you headache and you will go slowly on the learning prossess ... try to see this software as a tool ...
i mean ... before you start learning inside the spfware it self ... set your goal ... what kind of out put you want from this software ... then you your self can tell what commands you will need ... and how many commads you will use ...