I'm probably going to get some hate for this, but the LAMP stack. - Can all be run off one big server - No licenses or costs - Super stable and battle proven

I'm probably going to get some hate for this, but the LAMP stack. - Can all be run off one big server - No licenses or costs - Super stable and battle proven - Deployment, development, and debugging is stupidly simple - If you don't want to do your own server admin there are millions of hosts - Everything can be solved by Googling and copying and pasting - Developers are easy to come by - Frameworks such as Laravel and Symfony exist (not that you have to use one) Remember, you said easiest... not best. :) * Although "best" is subjective!!!