Welcome to Android Central! What email service do you use? Most email services have good spam filter settings. You can also report email as spam, so that the service learns.
I would also consider creating a new email account somewhere that becomes your main email for important contacts (like friends and business), and let your current one just become the spam account you use to register on websites and at stores. Many email services let you have multiple email addresses, so you could do this within the same service.