Not all of the spells work on here, a lot of them now seem to be 'fantasy', it's called 'fantasy' for a reason.
Some spells do actually work, but don't believe everything you see or hear.
For example, if it is a spell to turn into a werewolf or vampire, witch seems to be very big on this site, those type of spells don't work
You can't change your DNA, eye color, height, things like that.
For another example, you could cast a weight loss spell, it won't do all the work for you, but it can give you some confidence in losing weight
Spells should be the least of your concerns if you are a beginner, studying should be number one with starters.
If you have any more questions or want anything else explained more, feel free to ask.
Of course they don't.. As mentioned, fantasy spells don't work..in fantasy spells these subjects are included: Teleportation-flying spells, transformation into any mythical creature spells, making your self "other kin" or something (simply because other kins do not exist) and so on. People have invented crazy fantasy theories I cannot even imagine of, possibly more fantasy spells exist. A large amount of individuals is under a mazic hallicunation, believing they can turn themselves to something or perform sucesfully any kind of fantasy spells. Either that, or they're role-players...
Other spells may work yes, but some others won't work-even if they are possible to work. Spells may not work because you don't have strong magickal energy, you do not know how magick works and the basics.... Or because the people that made them have no idea what they're doing. That's why many say it would be better to create your own spells...
When you are experienced you'll be able to understand which work or not. You have to believe in them in order to work, because essentially you make them work, your self, through your desire for them.. That's why they say if you believe and really want the spell to work, it will.