Hi
Buckling - one is the linear buckling solver/analysis, and the other is doing an nonlinear analysis (large deflections/geometric nonlinear + material nonlin.) to find the buckling load.
Linear:
I would recommend to look at our linear buckling course (uses the linear eigenvalue buckling solver):
https://courses.ansys.com/index.php/courses/linear-column-buckling/
Nonlinear:
For nonlinear buckling you can search and also the forum here has many posts on that.
Material to look at:
FInally there are many good discussions about these topics (search on the internet):
All the best
Erik
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