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Group 1 - Taxpayers are required to retain documentation for vocational qualification continuing education, including relevant certificates [2] - Taxpayers must keep records of housing loan contracts and repayment vouchers [3] - Taxpayers need to maintain housing rental contracts or agreements [4] - Taxpayers should retain written agreements for the allocation of elder support [5] - Taxpayers are required to keep original or photocopied medical service charges and reimbursement documents for major illnesses, or a medical expense list issued by the medical insurance department [6] Group 2 - The article mentions that graduates renting houses can enjoy individual income tax benefits [8] - It raises questions about whether individuals need to reapply for individual income tax special deductions after changing jobs [11] - It also inquires if a "tax preferential identification code" is necessary for enjoying commercial health insurance tax benefits [11]