What should I buy in the Courier Station?

I make it a matter of course that I buy absolutely everything that is available for resources, not gems. I hardly buy anything at the Courier Station with Gems.

Making purchases at the Courier Station helps fulfill the Daily Tasks, and also it's often the case that you are just spending resources on one resource with another, for example spending 100k wood to get 150k food.

Seeing as you always need loads of resources, to me it doesn't matter too much which ones I get, as long as I get more of them!

I also buy the boosts, as using boosts every day is also part of the daily tasks.

Buy all the ones in the first 2 rows that cost resources. Buy the same from the other two rows if it is something you really want. Then buy the ones from the first two rows if it is 70% off or more and in the last two rows if it is 70% and won’t break the bank. Only buy with gems if there is an event running that rewards you for courier purchases.