I will talk about a process that starts before the employee's first day and helps him/her feel more comfortable, and the team benefit more quickly from the newcomer.
How many stages are there in onboarding?
Who should do them? HR, the lead, the team, the colleague or all together?
How quickly should you give the employee real tasks?
Does it all need to be "spelt out" or let him/her sort it out himself?
Is onboarding really necessary?