Question about bill gate

what programming languages bill gates knew before he started writing Windows ?

From Wikipedia:

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Gates took an interest in programming the GE system in BASIC, and was excused from math classes to pursue his interest. He wrote his first computer program on this machine: an implementation of tic-tac-toe that allowed users to play games against the computer.
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... studied source code for various programs that ran on the system, including programs in Fortran, Lisp, and machine language.

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At age 17, Gates formed a venture with Allen, called Traf-O-Data, to make traffic counters based on the Intel 8008 processor.
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thanks supermaster i read but can u explain bit more as i didnt get.

if u can make it simple words it will easy to understand for me

OK in short, before starting work on Windows, Bill Gates knew the following programming languages.

BASIC , FORTRAN, Assembly Language and LISP