How to approach web app development?

I have been going through Flask and it seems that now I have a decent understanding to go ahead and build a web application. However I want to know how would I approach the problem. For eg: I decide to build a blogging application. The first thing I do is write down all the things that come to my mind, from user registrations to posting data on the blog to publishing it on the site

But after that I just get into coding. I know that is not the right approach. I have heard of UML diagrams, workflow diagrams and stuff. It would be great if someone could just outline the steps they would follow for building a large application and then I could go ahead and learn more about them.For eg,it could be something like the below:-

1. Collect requirements
2. Draw UML diagrams
3. Draw workflow diagrams
4. start coding

Please开发者_Python百科 suggest an exhaustive list so that I can make my approach much more systematic. Thanks

That all sounds like a lot of work. Try web2py. You get a lot of stuff, such as user registrations and updating data for a blog, for free. Then just write the code. web2py is not as freeform as flask, there is a "one right way to do things". But for beginners, that can be helpful until you have enough experience to go it on your own.