I have been blogging for all my online life now which reaches back to the very early 2000s. This is a very long time and it resumes all the technical background content management systems (cms) and blogging in general went through. I started with plain HTML, used all the famous blogging platforms (blogger, blogspot, livejournal, pitas, twoday, probably more..) and later found my home at (a self-hosted version of) the cms Wordpress like many others. My blog at rike.dev has been running quite a while on Wordpress.
For quite some time Wordpress seemed like the only popular solution for content-driven webpages, but in the last years some new paradigms in content management evolved that basically try to level up content management into the new web app age. I gathered some really short information about general cms concepts:
Traditional cms (= Coupled cms = Monolith cms = Regular cms)
This is what most non-technical people and content managers love: Traditional cms provide a monolith consisting of a backend and a tightly connected frontend that both work on the same database. The backend comes with a GUI and often with a WYSIWYG editor so that there will be no need to write code. Traditional cms like Wordpress come with a big set of addons, plugins, themes and - which is great - a very devoted community. They can be maintained by non-technical persons up to some point, though their configurations can get messy and complex.
Decoupled (= Hybrid Headless cms = Hybrid cms)
Decoupled cms crash the tight connection between the frontend and backend typical for traditional cms. The new approach is: The frontend consumes data from the backend via API, so it will never perform direct database operations. Decoupled cms also assist with a tool box including optional templates just like traditional cms enabling also non-technical people to publish their content and push it to various channels. A popular use case for decoupled cms are web shops.
Headless cms (= API-first cms)
They are defined as asubset of decoupled cms and go one step further: Chopping off the head of a traditional cms completely leaves a cms without a coupled frontend component: This means that the content will be provided in a raw data format, like JSON. This type of cms simply doesn't care about the devices and services that will consume the data created by the backend GUI. A popular buzz word connected to this paradigm is Content as a Service (CaaS), which puts the headless cms up into the cloud, providing a chargeable service to its customers, maybe you have heart of Contentful, or other services.
Most (self-hosted) decoupled and headless cms still rely on databases, e.g. MySQL, PostgreSQL or MongoDB. For complex projects this might be a practical approach, but for smaller websites or blogs a flat-file cms could suffice: it does not require a database but rather, saves it's data to a set of text files, often XML files.
So which paradigm to choose for my blog?
At first I thought about using the (quite new) Wordpress REST API, but that would have meant to stay with the PHP/MySQL stack. What I definitively wanted was a flat-file cms without any database connection, just to keep it simple. Unfortunately, many flat-file cms still rely on PHP. Also out of simplicity decoupled cms were no alternative, so I searched for an API-first alternative and almost fount what I needed with Open Source projects like e.g. Strapi. But those still felt bloated and like an overkill to my use case, and I didn't like the thought of caring for another microservice on my server.
Just for fun I build my own super simple cms: It provides just one content type ("posts") so its use case would be blogs, mostly. It persists all posts into a simple JSON file without any database setup which makes it easy to backup as well. It has got a basic auth mechanism with only one admin user and of course provides its data via REST API. Like that the posts can be embedded simply anywhere - that's where your frontend skills are needed, no matter if you are a React, Angular or even Android developer. You can check it our on my Github repository.
For my own blog, however, I finally decided for a cloud-based Headless cms, which works very well for me.
In the end, it's up to you use case which cms to choose!