Related to bits

#1

is bit is binary digits of any no like binary digit of 4 is 100 so thats how we store in memory and could we negative no

#2

A binary digit, or bit, is the smallest unit of information in a computer . It is used for storing information and has a value of true/false, or on/off. An individual bit has a value of either 0 or 1, which is generally used to store data and implement instructions in groups of bytes.
Yes we can store negative number using bits but we have different algorithms to do so.