Security is definitely a crucial aspect of using Bitcoin or hosting a business website. While there are plenty of resources out there, it can be difficult to know where to start.

One great resource for learning about Bitcoin security is the book "Mastering Bitcoin" by Andreas Antonopoulos. It covers everything from basic concepts to advanced topics and provides practical advice on securing your bitcoins.

For website security, the Open Web Application Security Project (OWASP) has some excellent resources on web application security best practices. They have a comprehensive guide that covers everything from authentication and access control to data validation and error handling.

In addition, attending local meetups or events focused on Bitcoin or web development can also be a great way to learn from experts in the field and get hands-on experience with different tools and techniques.

Remember that security is an ongoing process - stay vigilant, keep learning, and don't hesitate to ask for help if you're unsure about something!