I’m working for more than 23 years in the IT industry in Greece and Europe, fill in many different positions. During this period, I needed a lot of knowledge and skills I hadn’t had any resources that I lacked! And I still do!
In my line of business, you need to renew your knowledge every 2-3 years while you should master the ability to get rid of the knowledge, beliefs, and ideas, that no longer serve your purposes.