calculation of magnetic field lines

Where can i finde magnetic field lines calculation tutorial?

Not only ideal cases like 1 wire, i would like to learn if in the area is also a metal plates.....

Hi
if you want use software for that it's very easy to use softwares like HFSS and CST or if you mean analyticaly you should solve Maxwell equations theortical or nummerical

I mean to solve it theoretical and numerical on paper.