можете you can, you may сможете - it is about success, result. You'll be able, you'll manage to do that, you'll succeed. вы сможете читать по-русски - you'll be able to read in Russian вы сможете прочесть эту книгу - you'll be able (successfully and completely) read this book. вы сможете. You can do it.

It depends on the context, but in general, сможете is about result in the future, while можете is about your ability or permission to do something, i.e. можете - you may, you can сможете - you will make it Ты можешь решить эту задачу - You can solve this issue Ты сможешь решить эту задачу - You will be able to solve this issue