This non-comprehensive overview is a reference for those who might like to write their own code. Sharing via open source is a way to learn from the best around the world, therefor articles herein are mostly about open source software. If you want us to provide solutions for your business please contact us.
Remember prerequisites and revision levels are important when combining code modules. Prerequisites and revision levels are important when combining code modules. (repeated for emphasis) When searching the web for answers, understand that timing is critical. You may be reading a document and downloading a module or code snippet that was created several revisions ago. Would you attempt to put a Model A tire on the current years sedan? Why would you think that code written several months ago will work with the new revision of a language or other module? Beware deprecation.
In the same line of thinking beware of psuedocode. In a Question and Answer example that sort of, kind of, aught to work, but when tested, one finds that it is riddled with syntax errors, or is way out of context because it is missing significant related and required code. The former happens for two reasons. The writer is extremely familiar and just types from memory possibly missing a few important characters here and there, or the code has characters that do not translate well into HTML and needs to have special characters that essentially make the example different from the working tested code.
Code will be based on a model of the way you and your customers perceive your data world. To help communicate your understanding, you might draw a UML, flow chart, state or other diagrams. In tandem with the model designed, choose a software design pattern such as Object Oriented, Model View Controller, Procedural or Functional which will finally affect the choice of a programming language. At each phase of the project you will need a test plan for your code testing. There may be some parts of the code that do not work as planned and need debugging. Do not spend too much time on or be overwhelmed by the above theories. To get started fast use the Proudly Found Elsewhere theory just copy some already functional open source code from a code repository such as Git Hub, Source Forge, or Open Hub.
It may help in your pursuit of coding knowledge to study of bit of history of computing. Further you may want to quickly peruse the seminal work "The Art of Computer Programming" by Donald Knuth to pick up a broad overview of important computing terminology.