Normal numbers are in base 10, meaning once you reach the value of 10 (1+1+1+1+1+1+1+1+1+1), you move number places (1 becomes 10), in base 2 (binary), its like that but 2 is the new upper bound
so 0 is 0
1 is 1
10 is 2 (because 2 cannot exist in a single number place the same way 10 can't)
11 is 3
100 is 4
101 is 5
110 is 6
111 is 7
1000 is 8 (every power of 2 is 1 followed by (x) zeros where 2^x = the actual number value. So 2^3 (3 zeros) is 8, 2^4 (4 zeros) is 16, etc)