There are hundreds of books with this theme on the market. Following simple advice should suffice for most home users..
Use a Firewall Use a good anti virus program and keep it updated Use a good anti malware program and keep it updated Always log off when you use on line banking or credit card sites and never use these on a public computer Take care when opening emails from persons/companies that you do not know and never download and open attachments from unknown senders. Do all that and save your money buy not buying "help" books. Most sites like this and computer mags will normally be the best places to get help and advice.