Update README.md

Signed-off-by: Fabiana 🚀  Campanari <113218619+FabianaCampanari@users.noreply.github.com>

Author: FabianaCampanari

README.md

@@ -191,9 +191,9 @@ Thus, the maximum profit achievable is [**R$ 5,100**]().
 
 The **graphical method** for solving simple linear programming (LP) problems involving **two decision variables**. The graphical method provides a visual way to understand the constraints, the feasible region, and how to find the optimal solution that either maximizes or minimizes the objective function.
 
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+#
 
-### [Key Concepts]():
+### [Key]() Concepts:
 
 - **[Decision Variables]():** These are the variables that we want to determine the values of to optimize the ***[OBJECTIVE FUNCTION]()*** (e.g.):