Limit order allows you to set a price at which you want to buy or sell.
Market order is executed immediately by matching counter-orders in the order book.
The hidden order option allows you to place large buy or sell limit orders anonymously without revealing your interest to other traders (hidden orders do not appear in the order book). Large orders, when seen by other traders, may cause the market to move unfavorably, making it more difficult to fill the order at the desired price. If you place a hidden order, you will always pay the taker fee.
Limit + Stop order allows you to set a buy or sell limit order and a stop loss price. Stop price triggers a market order when the last traded price hits the Stop price that you specify. You can for example set a desired limit sell order above the current market price and a stop sell price below the current market price to limit potential loss in case the market moves against you.
The trailing stop option moves the stop price at a set distance with the market. If the current market price is for example 100 and you set a trailing sell stop at 95, and the market rises, then the trailing stop rises accordingly, always staying 5 behind the market price. If the market then starts moving down, then the trailing sell stop will stay at the maximum it reached.
Post-Only (also called Maker-Or-Cancel) the entire order is either placed as maker, or if any part of the order can be filled immediately, the entire order is canceled (ensuring you pay the maker fee only).