Quantitative Analysis: Description and Inference

http://statistics.laerd.com/statistical-guides/descriptive-inferential-statistics.php

This is a quick source for differentiating between Descriptive and Inferential Statistics. It gives numerous examples for both types of statistics and provides links for other relevant statistical concepts such as measures of central tendency, measures of dispersion, and testing of statistical hypotheses.

This short video on YouTube discusses different types of data: nominal, ordinal, and interval.

http://iridl.ldeo.columbia.edu/dochelp/StatTutorial/Dispersion/
This is a very useful link for understanding the measures of dispersion. The concepts such as range, interquartile range, standard deviation, Median Absolute Deviation and Trimmed Variance are explained with reference to different examples. It also offers various exercises for further comprehension.

This useful video explains measures of dispersion in an accessible way, and using easy examples.

https://socialresearchmethods.net/kb/statdesc.php

A summary of types of descriptive statistics, how they are calculated, and what they can tell us.

https://towardsdatascience.com/intro-to-descriptive-statistics-252e9c464ac9

A detailed introduction to descriptive statistics. The sections up to ‘modality’ are likely to be most useful to students of politics and international relations.

https://www.statisticshowto.datasciencecentral.com/probability-and-statistics/descriptive-statistics/

Tips for calculating descriptive statistics in Microsoft Excel.