week 1 viruses and malware

Today I learned about computer viruses and worms.I learned about what viruses and worms are and the differences between the two of them, viruses affect only one computer where as worms spread to other computers. I also learned about the different types of viruses from file infector virus to macro virus and how you cant detect wether or not you have a virus on you computer by looking for symptoms like computer running slow and files appearing out of no where and different ways you can prevent getting a virus or a worm.