Does taking up extra roles at work show that I am hard working?

Like in life, the workplace is not always fair - it is not your role to police your colleagues. How you handle the behaviour of a lazy co-worker depends on whether it substantially affects your work.

How do I deal with lazy co-workers who make you pick up the slack at work and do not mind taking credit for the work done?

Like in life, the workplace is not always fair - it is not your role to police your colleagues. How you handle the behaviour of a lazy co-worker depends on whether it substantially affects your work.