Okay .. perhaps you have identified a couple of areas where the rules may need some further clarification .. but to answer your questions ...

A tank cannot move to or over balck squares (mines).

It is true, the following stops (blocks) the movement of your tank - a friendly tank, a mine, the pink squares (unless it is the commander), or a enemy tank. Of these obstructions, you may only move to occupy the square of an enemy tank (unless it is the enemy commander in the pink squares).