Thinking about a career defined as sequence of well paid jobs you can already start building your portfolio keeping in mind what potential employers are usually

Thinking about a career defined as sequence of well paid jobs you can already start building your portfolio keeping in mind what potential employers are usually looking for - experience and activity. Nowadays that means a GitHub profile featuring both own projects and contribution to FOSS. Besides that it will always be beneficial to build a network of contacts, by being curious, kind and helpful. It's a very general advice, but important anyway IMO.