Choosing an open source license
Apache License 2.0 for workflows and medium-large software projects and libraries that should be integratable, or where you may get contributions (as it automatically applies itself to contribution received and adds patent suit protection). For larger datasets that may have mixed licenses or attributions.
MIT for small useful snippets you may want to copy-paste other places including GPL 2 (Apache only works with GPL3 because of said patent protection). (BSD 2-Clause is a variant of this, but less explicit about what is allowed)