People have been saying co-ops and internships however I found it most difficult to acquire these because I did not use my academic advisor to help me. Always speaks to your academic advisor they have the contacts to help you get an internship or co-op. With that being said it’s about who you know that gets you the opportunities it’s not based on merit as much in the modern day, unfortunately.
Secondly, do research with a professor in a track related to your interests. During your college journey around the sophomore-junior year is when you have more experience working in various labs for class i.e(chemical lab, physics lab) and professors will realize you have experience and matured in your academic journey. The research will expose you to practical skills that can be put unto your resume. With research comes the ability to understand the time and effort required to do so. You will know within a month if doing research is going bring you satisfaction.