What to take away from this?

While developing the application, there were a few things that stood out for me (although some of them are probably obvious):

• Before making a timeline, get to know your tools
  • I didn't have enough knowledge of the framework I was using to develop a useful plan
  • Modeling in UML only works if you know what the language and framework are capable of
  • Using Python like Java doesn't work
  • Importing classes from Notebooks seemed easier/ possible at the first glance
• Define the core features before starting to code and define priorities for the remaining features
  • I lost a lot of time on features that aren't essential to core functionality like LoadScreen, StatusScreen, testing classes/methods (arguable)
  • Build everything around core functionality, a pretty application is no use if it doesn't work properly
  • Ideas for more features introduced a lot of side quests, which killed time that could've been used in creating core functionality
• Program/ Implement in small steps and test + commit EVERYTHING
  • After planning the layout of my classes I started implementation in big steps, without testing or commiting in between
  • Implementing big structures without testing in a language and framework you're not a pro in, is a bad idea
  • I had to do a lot of correction and copy + paste, because I sometimes forgot to commit new stuff for a few hours and couldn't go back to it or lost it