Example:

Let's spell out "Hello" in binary. We can look up the letters in the ASCII table to find their corresponding numbers: H is 72, e is 101, l is 108, and o is 111. Then we can convert each of those number to binary. Be careful to always include 8 digits for each letter! You may need to add 0s to the left part. For example, H is 01001000.

The entire message reads 01001000 01100101 01101100 01101100 01101111 00100001.