get some books on HTML coding and use Notepad or another simple text program. You only need html for the vast majority of web sites. No benefit is gained from JavaScript, asp, or anything else unless you're using the site to gather data from the visitors, such as a web sales sites where they're buying things.
Plain html makes for smaller files and quicker loading, it's best for simple information sites like yours appears to be. But it does mean you have to know the basics of coding, which are simple to learn, I did at 50 years of age.
Many programs use Java, JavaScript and similar programs as they're easier for novices who know nothing to use to create a web page. But they create much larger files and can cause difficulties with high security gateways, many block Java and JavaScipt as being potentially dangerous. Thus people behind the security screen can't view the site.