There are YouTube influencers for every niche interest. The pattern you describe can be found in people talking about diets, exercise, fashion, home remodeling, etc. Creating novel terms is one way for influencers to differentiate and increase their views and search rankings... but I agree that it makes things far more complex and inscrutable than they need to be.

The best way to start journaling is to write a little bit every day with whatever tool has the lowest friction for you.