During my Ph.D., I was working in a multidisciplinary and highly collaborative research group, I was able to learn some additional skills on materials characterization outside my "own" area. Here are some examples:

X-ray photoelectron spectroscopy (XPS)
Gel permeation chromatography (GPC) and Ultra-performance liquid chromatography (UPLC)
(maintenance, calibration, SOP, etc.)
Pitt XPS.jpg
Image courtesy: University of Pittsburgh
Transmission electron microscopy (TEM)
New DMF GPC 03-2022.jpg
Other skills:

FT-IR, porosity analysis (Nitrogen adsorption-desorption), thermal gravimetric analysis (TGA) , dynamic light scattering (DLS), fluorescence spectroscopy, Raman spectroscopy.

Software (besides common office programs):

Gaussian (software), Mathematica, Minitab, Avogadro