What should I buy first in Monopoly?

What should I buy first in Monopoly?
How to win at Monopoly – a simple strategy:

Always buy Railroads; never buy Utilities (at full price)*
At the beginning of the game, focus on acquiring a complete C-G [Color Group: all 2 or 3 properties of the same color] in Sides 1+2, even if it means trading away properties on Sides 2+3.

How to win at Monopoly – a simple strategy:
  • Always buy Railroads; never buy Utilities (at full price)*
  • At the beginning of the game, focus on acquiring a complete C-G [Color Group: all 2 or 3 properties of the same color] in Sides 1+2, even if it means trading away properties on Sides 2+3.