[2] It can be expressed in formal and systematical language and shared in the form of data, scientific formulae, specifications, manuals and such like.
[3] It is easily codifiable and thus transmittable without loss of integrity once the syntactical rules required for deciphering it are known.
The SECI model involves four stages where explicit and tacit knowledge interact with each other in a spiral manner.
The most common forms of explicit knowledge are manuals, documents, procedures, and how-to videos.
In the scholarly literature, papers presenting an up-to-date "systemization of knowledge" (SoK) on a particular area of research are valuable resources for PhD students.