kaycome,
when you ask about IT skills are you referring to general IT skills, applicable to most other professions, or IT skills related to IT functions (Software Engineering, Programming, Network etc.)? If you are asking general IT skills, depending on your profession, I would recommend advanced Excel. I work in Accounting/Finance and it's not easy to find people that have advanced Excel skills. I would also recommend SQL to understand how databases work and how you can extract and analyze data. If you want to add even more to your resume, I would suggest to learn a good BI tool, e.g. Tableau. It's a powerful tool that not many people know how to use it and it can help you get a job fairly quickly.
Joster