The previous title (Bonds Trading Bonds) was a James Bond reference. Thanks for letting me know that was not clear enough. I thought it was witty XD.
Regarding the bonds ETFs from my understanding so far, since they don’t hold the bonds to maturity, make the calculation of the YTM a bit more complicated. So knowing how the specific ETF works is very important as well knowing what are the bonds in it so that you can have an idea of how the price will be affected by the introduction of new bonds with higher or lower coupon.