i dont understand binary

What does any base mean?

Our numbers are usually in base 10

so

$$\\5689(base 10) =5689_{10}= 5*10^3+6*10^2+8*10^1+9*10^0\\\\$$

With base 10 there are 10 digits.

0,1,2,3,4,5,6,7,8 and 9

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NOW base 2 has only 2 digits   1 and 0         BINARY IS BASE 2

this number

$$\\100111_2 = (1*2^5)+(0*2^4)+(0*2^3)+(1*2^2)+(1*2^1)+(1*2^0)\\\\ 100111_2 = 32+0+0+4+2+1\\\\ 100111_2 = 39\;\;base\;10\\\\$$

I hope that helps but feel free to ask questions :)