Group 1 - The article discusses the lesser-known bond index funds compared to stock index funds and introduces a free course on how to invest in bond index funds [3] Group 2 - It explains the difference between on-exchange funds (like ETFs) and off-exchange funds, noting that on-exchange funds can be traded like stocks [6] - It highlights scenarios where ETFs may not be sellable, such as during extreme market fluctuations when trading prices hit limits [7] - The article mentions the risk of extreme premiums in some US ETFs, where premiums reached 50%, leading to potential trading halts [10] Group 3 - Off-exchange funds allow investors to redeem based on net asset value, ensuring that even during market downturns, investors can redeem their funds [11] - It outlines situations that may cause off-exchange funds to halt trading, such as holidays or triggering large redemption clauses [12][14] - The article clarifies that while large redemptions may delay processing, they do not prevent redemption altogether [15]