There are tons of courses and tutorials about specific technologies and programming languages such as: JS, HTML, Python, etc.
However, the field of system analysis lacks the same attention that technologies enjoy.
Is there unified methods for system analysis/modeling?
What if I need to model an accounting system for a specific business, it there any modeling techniques that can describe the system?
I have found a method called REA (Resources, Events, Agents) but doesn't seem widely accepted and practiced.