Autocad Learning

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to Remove the extended portion of a line or a portion of line between two other lines (Trim) , press
tr then Enter and Enter again
then select the portion to be trimmed , it will be trim.

To draw a circle write the command
C => Enter
then write the radius of circle then press Enter
you will get the required circle

press F8 for ortho drawings (perpendicular lines)
press L => the press Enter => put the dimensions (simple no such as 3 or 4 represents the unit feet for inches write as 3' or 6')
=>then press Enter
you will gt the line of required length