This article acts as a cheatsheet for International Standard Classification of Education (ISCED 2011) developed by UNESCO Institute for Statistics. The standard was developed initially by UNSECO in 1970s and revised in 1997. The standard helps benchmark, compare , and monitor performances of education systems across countries. The full document in available from the link - international-standard-classification-of-education-isced-2011-en.pdf (unesco.org). Please refer the document for full classification and coding guidelines.
Informal and Incidental Education are out of scope of ISCED.
The fields have been updated in 2013. Groups and Fields of Education as per 2011 standard is available from https://edusanjal.com/blog/isced-fields-of-education-2011/.