You can remember the meaning of 本人 with this easy mnemonic:
The fangirls were shocked when Twitter <strong>sources</strong> (本) said their crush was in the same restaurant as them. They thought the <strong>man</strong> (人) was a lookalike but no, he was the star <strong>himself</strong>.
Using mnemonics to remember the meaning of Chinese characters like can have an enormous impact on how long to learn Mandarin it takes.