by davypi
There is a whole forum devoted to this:https://boardgamegeek.com/forum/1626/le-havre/strategy
Set aside an hour or so of your day and just read. Its worth it. Thats how I learned a lot of the game.
If you feel like committing a couple of hours to playing a solitaire game, this thread: 400+ points in solo game is a amazing because it walks you through, turn by turn, how to max out your score in a solo game.