The tool suggests buildings you should collect after the BG to get the biggest rewards. These are the buildings with the highest FP or goods production.
Out of the box this should already give you a useful suggestion in most cases.
The “good value in FP” is used for fine tuning if you want to prioritize goods or FP. The default value is 0.2 FP per good or 5 goods per FP. This means a building producing 50 goods is considered as good as a building that produces 10FP or a building that produces 5 FP AND 25 goods.
To find the best value for you just ask yourself the question “how many FP is one good worth for me?” or “how many FP do I have to pay if I buy the goods with FP?”
If you select a value of 0 the helper will not care about goods at all.