part and body in 0.17


in Version 0.17 some things seem to have conceptually changed.

When i click on a surface and want to create a sketch on that, i offen get the error-msg: „In order to use PartDesign you need an active body object in the document […]“.

Does anyone know where i can find the dokumentation on that, which explains the difference between part and body, or a good tutorial ?

Best regards,

finally i found some info on