I realize this has been asked a bunch. I just want to make sure that how I go about this is correct.

I have created a landing page using HTML/CSS/JS which will be at www.advantecglobal.com/welcome

The home site is built in WordPress, www.advantecglobal.com. I want only the home page of www.advantecglobal.com to redirect to this landing page www.advantecglobal.com/welcome, not the entire site, so no 301 redirect. In my research I have found that adding this code to your htaccess will redirect your home page only?

RedirectMatch ^/$ http://www.advantecglobal.com/welcome

any insight would be appreciated

Thank you kindly

Read more here: Advice on intermingling HTML/CSS/JS Landing Page with WordPress