Hi
I would recommend first to have a course in FEA (theory and practice) - one is offered for free (EDX:
https://www.edx.org/course/a-hands-on-introduction-to-engineering-simulations).
After that to learn the use of the Ansys WB/Mechanical software I would suggest to start with this course:
For large deflections and contact:
For instabilities:
There are many other course that will be relevant, see here for a full list:
All the best
Erik