The most important thing is a concept. You should be aware, that not every customization should be made as a plugin for Sylius. If you:
- share the common logic between multiple projects
- think provided feature could be useful for the whole Sylius community and want to share it for free or sell it
then you should definitely consider the creation of a plugin. On the other hand, if:
- your feature is specific for your project
- you don’t want to share your work in the community (maybe yet)
then don’t be afraid to make a regular Sylius customization.
For needs of this tutorial, we will implement a simple plugin, making it possible to mark a product variant available on demand.