When you are "protecting trade" riseordie, you are massively increasing your trade power in that node.
You then use your trade power to be able to steer more trade.
My example:
Playing as Ottomans. I want to collect trade in Constantinople (my capital): Send one merchant there to COLLECT.
Looking at the Constantinople trade node there are tabs at the top listing connected nodes (in order of amount of money) with incoming on the left and outgoing on the right.
Alexandria is a large node that is incoming to Constantinople, so I decide I will compete there to STEER more money towards Constantinople. I send a merchant there to do this.
The amount I steer and the amount I collect (out of the total value of each node) is affected directly by my relative power in each... so I will send light ships to both to increase said power.
edit: funny riseordie has been a complaining, super negative troll the last few days... and now he's completely clueless asking for help on basic things :/
You then use your trade power to be able to steer more trade.
My example:
Playing as Ottomans. I want to collect trade in Constantinople (my capital): Send one merchant there to COLLECT.
Looking at the Constantinople trade node there are tabs at the top listing connected nodes (in order of amount of money) with incoming on the left and outgoing on the right.
Alexandria is a large node that is incoming to Constantinople, so I decide I will compete there to STEER more money towards Constantinople. I send a merchant there to do this.
The amount I steer and the amount I collect (out of the total value of each node) is affected directly by my relative power in each... so I will send light ships to both to increase said power.
edit: funny riseordie has been a complaining, super negative troll the last few days... and now he's completely clueless asking for help on basic things :/