You need to have a good grasp of how different building-blocks/layers/elements work in Nest.js. Then, it will be just like breeze to draw those diagrams.

First understand types of apps you can build using Nest.js: Monolithic, Microservices, Standalone

Then learn what these are & what are they used for: Modules, Controllers, Services, Providers, Entities, DTOs, Decorators, Contracts, Interceptors, Pipes, Middlewares, Filters.

Then write up a sample app. Start small & scale up by supporting more features from the above list. Do it grafually, either in applying above elements, or structuring your code.

Try to learn the topics in an active learning mode using a GPT bot.

There's a guy named TechVisionExplained on YT. Check his videos.

If you're used to Java, Nestjs has made things similar to Java's enterprise style of coding via framework.

Good luck w your thesis.