When it comes to smart bidding strategies on Amazon, there are several approaches you can consider. Four commonly used smart bidding strategies are dynamic bidding, bid+ (formerly known as Bid Modifiers), placement targeting, and keyword targeting. Dynamic bidding adjusts your bids based on the likelihood of conversion, helping you optimize your budget. Bid+ increases your bid for top-of-search placements, giving your ads more visibility. Placement targeting allows you to choose specific ad placements within Amazon's network to reach your target audience. Keyword targeting focuses on optimizing bids for specific keywords to increase relevance and conversions.