I think spells work not just because of things maybe working naturally in your favor, but in the sense that you're focusing your energy into it. When you're shifting your energy into your goals, you enhance your odds of things working out, I think.
That’s exactly how they work! :)
I have more information on what magick is and how spells work here:
What are some great sites that are 100% correct with information to learn and study about witchcraft
So many asks today omg!
But there’s no way to tell if a site is 100% correct. Some people may not agree with what’s on a certain site because of the many different paths there are in Paganism and Witchcraft. But I can show you the sites I like that have never steered me wrong. In no particular order:
This one has a bunch of spells and such. Although some of the spells are obviously made up or won’t work, but most of the spells are really good and I wrote down all the ones I like. (Don’t worry, it’ll be obvious which spells aren’t true spells when you see them): http://www.everythingunderthemoon.net/bookofshadows.htm
~Links 5 - 8 are all about Sabbats because they all have different information on the sabbats. The first tells you all about them and gives you a ritual you can do. The second has activities you can do, and the others just have other random stuff about them (Just in case you were wondering why there are so many Sabbat links lol).
Well, those were all the links I have bookmarked. Enjoy! :)