If you plan on following a power electronics career path, then I would strongly advise you to learn about magnetic design.
The magnetic components are the heart of a SMPS design.
With the ever increasing sophistication available from the newest switchmode controllers, and with all the tools and software available from the vendors, the essential SMPS design has been simplified significantly.
Vendors strive to have standard "off-the-shelf" magnetics for the reference design. Unfortunately, these standard magnetics may be to expensive, be only available in SMT form and you require thru-hole, or not simply available in the country where you live, or your requirement is different from that of the reference design.
In this case, you should be able to customize the magnetic design.
I encourage you to learn. It will make you far more valuable as an engineer.