SAVING AUTOCAD DRAWINGS:
To save your work, choose [Application Menu] > Save. Always keep at least one fully updated backup copy of your work in a safe place (e. g. one copy on a flash drive and another copy stored online).
OPENING AUTOCAD DRAWINGS:
To open a saved drawing, choose [Application Menu] > Open.
DIFFERENT EDITIONS OF AUTOCAD:
If you intend to work between two different editions of AutoCAD (for example, edition 2015 at school and edition 2007 on Granny’s laptop), remember that the older edition of the software cannot read drawings produced by the newer edition unless the drawings are deliberately saved in a compatible format. To do this, choose [Application Menu] > Save As in any edition of AutoCAD; choose the appropriate format from the available list.