Two for One
I lived in Argentina for a year and a half as a missionary, and beforehand received language training. I took great care in learning how to spell Spanish words and figuring out the differences between English pronunciation and Spanish. And then came the respite: B and V are the same sound in Spanish!
B and V are so similar to even the trained native ear, that when you are spelling out a word that contains them, you need a qualifier: “B larga” or “B grande” for B and “V corta” or “V chica” for V.
The English V involves essentially biting your bottom lip. But the English B is simply resting your lips together, and as you gently open them, pushing air out to say the letter. This is the same in Spanish. And it is completely identical for the Spanish V. You can rest know you have just mastered two letters at the same time!