Question related debian + freeBSD

[Carlos Mario]

Dear sirs:   A few time i was knowing the Free software.  Now i thinking install debian and freeBSD in my PC.   But i have a question:  if i want learn to admin the unix system, reallity is logic try to work at home with this 2 operative systems?    what can i learn if  i study this plataforms separalety????????   Please sorry my bad english, because my native language is spanish and cant spoken english well.   Best regards from Colombia,   Carlos Mario Mora