Why is the Moon the best starting place for an off-world industrial base?
Short answerIt is nearby, surveyed, solid enough to build into, and able to provide natural radiation shielding while new construction methods mature.
NotesThe Moon is favored because its location and basic conditions are already well understood. A surface base can anchor machinery and use excavated material for shielding, while a large orbital facility must provide those structures for itself. The same reasoning carries to a Martian moon, where construction teams would gain a protected platform before attempting a surface settlement. The proposed logistics sequence develops capability on the nearest workable base before transferring it outward.