Mas ok ung no bid limit kung willing ka mag spend ng malaking amount for sponsored discovery, pero kung may specific budget ka lang pwede ka mag set ng bid amount, pero yung placement ng ads mo wala sa top, unless ikaw yung may pinakamataas na bid amount. Hope this helps.

Kung bago ka pa lang sa sponsored discovery or search advertising as a whole, I would recommend to set a bid amount para your ad spend won't get out of hand. Tweak the bid amount higher for keywords with high search volume para tumaas yung chance na mapili yung bid mo for ad placements. Always monitor your SD campaign performance and i-optimize kung kinakailangan. Cheers!