Bread: You can use a variety of bread to make croutons. I often use a baguette, sourdough, or French bread. But ciabatta, whole grain, multigrain, rye, or sandwich bread can be used. You will need to adjust cook time.
Adjust temperature depending on the bread used. I recommend shaking the basket often and checking every 1-2 minutes to avoid burning— this is especially important during the second batch since it'll cook faster.
Do not overcrowd the basket. Leave space between each crouton to allow even browning. If needed, cook the croutons in two batches, but avoid overfilling the basket.
Important Note about Salt: Not all salts are made equal and cannot be substituted 1:1. If you are substituting table salt for kosher salt, you will need to cut the amount called for in the recipe by at least half.