Firstly, can I correct your question? You should say: 'I want to know how to use them correctly, thanks'. You shouldn't write words such as 'wanna' and 'em'. It looks ugly and uneducated. As for your question about 'all' and 'everything', here are some examples. All the clothes in this store are expensive = Everything in this store is expensive He ate all the food in the fridge = He ate everything in the fridge. As you can see, 'all' is usually followed by a noun (all the clothes/all the food) etc), while 'everything' is a pronoun that can stand alone. I hope that's clear.

Thanks for your advices, I hope you can help me :)