Sometimes you will need to order the eloquent results based on a relationship for example posts and categgories. Here are different ways to do so based on this laravel daily video : https://www.youtube.com/watch?v=lRi1-RYnQ7A
Sometimes, You will need to order by a varchar column as an integer. for example if you have the billNumbers in two rows as 5 and 1400 the order as varchar in desc order will get that with 5 first then that with 1400. While the opposite is what is wanted in the ordering using integers.