Step by step video tutorial showing Modelling of spanner, For more on this go to www.sourcecad.blogspot.in
Here is video tutorial for modelling spanner follow this link
for more similar tutorials go to www.sourcecad.blogspot.in
Answered with a tutorial: https://grabcad.com/tutorials/video-tutorial-for-creating-open-ended-3d-spanner-in-autocad
please guide me , which software is most modern or valuable in mechanical design field
there is nothing like most modern software for design industry it depends on which industry you prefer, Autocad is most fundamental one which you should learn and besides autocad any parametric software like catia, pro-E, solidworks will suffice.
good luck for your future :)