After submitting your resignation, what are the things you should do in the notice period?

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SMOOTH TRANSITION OF WORK WHOLE AND COMPLETE. FOLLOW UP YOUR CLEARANCE PAPER THAT WILL FREE YOU AND THE COMPANY  FROM ANY OBLIGATION AND LIABILITY 

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First, the delivery of all functions and the contract to the substitute employeeSecond, the search for a new job during the notice periodThirdly, to arrange for the receipt of the new job in the company to which he will join

Wind up your work, Communicate to stakeholders and departments about your last day and try to resolve all pending issues during that time, also dont forget to make a handover report and submitt it to your immediate manager prior your last day.