The expression $6 + (-1)$ can be simplified as follows:

1. Start with the expression:

$6 + (-1)$

2. Subtract 1 from 6:

$6 - 1 = 5$

So, the final answer is:

$5$

Would you like more details or have any questions? Here are some related questions for further practice:

1. Simplify $10 + (-3)$.
2. What is $8 + (-4)$?
3. Solve $7 + (-2)$.
4. What is the result of $5 + (-5)$?
5. Combine $9 + (-6)$.

Tip: Adding a negative number is the same as subtracting its positive counterpart.