Every codebase carries some amount of technical debt. Every team would like to get better at managing that tech debt.
The first step in managing something is making it visible. A tech debt wall is a simple, effective way to make tech debt visible.
Pete Hodgson wrote a nice article about Tech Debt Walls which can be found here: https://blog.thepete.net/blog/2020/12/01/tech-debt-walls/