If you flip three coins, the branch that begins with heads leads to the possibilities and the outcomes

When you flip three coins, there are eight possible outcomes. If the first flip results in a head (H), you then have two more coins to flip, each of which can also result in either a head or a tail (T). This leads to the following four possibilities:

1. First flip is a head, second flip is a head, third flip is a head (HHH)
2. First flip is a head, second flip is a head, third flip is a tail (HHT)
3. First flip is a head, second flip is a tail, third flip is a head (HTH)
4. First flip is a head, second flip is a tail, third flip is a tail (HTT)

So, the branch that begins with a head leads to these four possible outcomes.