Tutorial:Mun Super Easy
This tutorial will show you the easiest way to land on the Mun and come back. This does not require gravity assist, docking, etc.
Step 1: Build Rocket
The first thing you need is a rocket. This will be a modified Kerbal X. First, load the Kerbal X. Delete the parachute, fins, radial decouplers, and radial boosters. We will delete the capsule later, but you need it on to edit. Turn on 8x Symmetry Mode and place TT-70 Radial Decouplers near the middle of the first stage. Add S1 SRB-KD25k "Kickback" Solid Fuel Boosters on the decouplers. Place Aerodynamic Nose Cones on the boosters. Turn off Symmetry Mode. Now delete the capsule and get a Mk1 Command Pod. The rest of the rocket will turn red. Set it aside. Now place a FL-T800 Fuel Tank below the capsule and add a T-1 Toroidal Aerospike "Dart" Liquid Fuel Engine below that.