Limit Orders are a very basic tool that you can only use in a few ways.
Limit Orders and Starbonds
Starbond TAGs are updated late afternoon on Mondays when the boxoffice actuals are posted (and movies are delisted, opening weekend derrivatives are delisted and adjusting starbonds are halted). Many players are not around during the day when starbonds adjust so they set limit orders. Once the weekend boxoffice is posted, starbond TAGs are updated and we know what the starbond adjusts will be. If you are holding a starbond long at $10, and after box office is posted and TAGs are updated, and you see that that starbond will be adjusting to $15, then you can set a limit order to sell that starbond at $11(or any price between $10.01 and $14.99). The next day at adjusts, the starbond passes $11 and adjusts to $15 and your order is triggered and your starbond is sold. You can also set a double limit order if you wanted to flip the stock. You set one limit order to sell at $11 and set another limit order to short at $11. When the adjust happens and the starbond moves to $15 (passing $11) then your limit orders are triggered and your longs are sold and you short however many shares you entered in the limit order.
Limit Orders with OWs
Pretend the OW stock is priced at $35 and you believe that is a good price. You do not believe that that movie will make $40. Halt time is coming soon. You can set a limit order at $40 to sell the OW stock, and go do the things that you do (work, gym, etc...) and HSX will sell your OW if the price goes over $40.
Limit Orders in the past
Moviestock Adjusts
Many players used limit orders in the past for moviestock adjusts. The weekend estimates were usually posted an hour (or so) before HSX performed the official adjusts. Players had a real good idea for what the adjusts were going to be and could set limit orders to dump the stocks after they adjusted or flip them after the adjust. This became outdated a few weeks ago when opening weekend adjusts were removed from the game.
Pennystocks
It was a common practice to short moviestocks that were priced between $0.03 to $0.50 and then set limit orders to flip the moviestock if it reached $0.02 (1 limit order to cover the shorted shares and 1 limit order to long shares). This became obsolete a few years ago when HSX adjusted the sensitivity of the game (every trade moves the price) and there was some dude bragging about how much money they had made investing in pennystocks which caused lots and lots of players to set pennystock limit orders and when the moviestock did make the $0.02 price then there were like 100 limit orders tripped at once (and each one moved the price) and everybody covered at $0.02 but nobody got longs at $0.02 (lucky if you got it less than $0.05 - $0.10)