People ask why their spells didn't work and how to get it to work if they try again.
I always give them this simple answer: Follow the 3 musts of casting.
3 Musts of Casting a Spell:
Understanding- know what it is you're doing/casting and all the consequences involved.
Will- you must want it to happen.
Belief- know it will happen, no doubts.
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Others occasionally enjoy adding to the 3 musts I've spanned out because casting spells takes a great deal of various things and if someone would like to add a little something please feel free to do so.
This was just the very basic needs to cast a spell and it actually work.