Tips on expanding my knowledge in the field

Hey all I’ve been in this field for almost two years now and have learned a significant amount. However, most of the people that taught me have left the company. How can I keep learn more? Can be anything. Filing different entries, post summary corrections, ftz’s, etc. I know this job is a lot of learn as you go, but is there any material I can read, courses I can take? Videos to watch? Anything! How could I get myself to be more computer savvy, like better with excels and such? Any tips are greatly appreciated. Thank you!