Here we are going to make a flip-flip based 4 bit counter . ie it count 0000-1111 in binary system. Clock of first flip-flop is either natural crystal clock or output of 555 timer IC . As we know if the J and K input pin of flip flop are both high then the output toggles every clock cycle . So all J and K terminal of ff are made high and all ff output toggles with some delay and hence there it can count upto n’th flip flop assuming each flipflop is one bit .If you wanna increase bits then you need to increase flip-flops.
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