Thoughts on the software development model

As a software engineer, my new attempt is not based on the software engineering process. I need to analyze the requirements first, and then write the code in summary and detailed design. Another mode: write the code first, break down several core difficulties, encounter many problems, and it is not good, so I go back and start requirement analysis. The key technology implementation has a bit of thinking, however, the project may have to be re-developed. Compared with the advantages of the waterfall model, this model knows some technical implementation details. The disadvantage is that it does not know the needs, and the project development is very confusing. If you go back to the waterfall model and develop it again, you can add technical implementation details in the demand analysis stage.