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Ok starting of, I use AutoCAD every single day; there are many different types of Autodesk AutoCAD, from architecture to LT to electrical etc.
Each one has different tool that allows the user to perform specific tasks.
However the electrical version is not suitable for an architect, yes you can do standard plans etc but you can't draw dynamic wall windows and other elements that you would want to include.
The same can be said if it was the other way around, and architect would very rarely want tools on AutoCAD that allow him to draw an electrical circuit.
AutoCAD LT has no sector based tools. It is compatible for most people to use. It is the equivalent to Microsoft paint in some aspects, you can draw boxes and other simple shapes, and with the right experience you can make these shapes into working drawings.
However I personally only use LT as a last resort, mainly because I use AutoCAD architecture. When I have to use LT for whatever reason it feels like a step back.
Don't let this put you off though, like I said different people will find it easier to work on different programs, for people who do not use AutoCAD all the time, LT is great because it offers a 'standard' cad package that is not biased towards any particular type of job.
The only thing I would insist on telling everyone who uses any model of AutoCAD is to simplify your toolbars.
It makes it so much easier if you only have the toolbars that you use regularly showing.
You can even make customised toolbars to show single commands to simplify things further.
A bad point would be to make sure your computer is up to the job, if its not cad will either run slowly which will make anyone pull their hair out with rage or it will crash.
Do not fear if it crashes though, AutoCAD has a clever feature called recover which will recover your drawing up to either an auto save or similar.
Plus .bak files are created which will back up your file along with your saved file.