What do you intend to do with those skills, and what are you specifically looking to learn?
I could recommend courses and certifications in networking, cryptography, programming, data analysis, Microsoft Office, etc. However, this will be overkill if you just want to improve your skills for a basic admin job (most of the above won't even be relevant).
Likewise, it makes no sense for me to recommend you on courses in Java if you need to learn about Python.
You need to be a lot more specific. "ICT" is very open ended.