Here is an excellant blog post from Kirk Evans, an MSFT Engineer on Host named site collections in SharePoint 2010. This post really blow away the fear people had on recommending and implementing site collections with host headers. What Every SharePoint Admin Needs to Know About Host Named Site Collections
Practical notes on Microsoft 365, SharePoint Online, Entra, Azure and PowerShell - from an IT consultant who's been working with Microsoft technologies since 2004.