This tutorial covers plotting structural geology data in ArcGIS. In this tutorial I am going to use the example of plotting foliation data, but this is applicable to any data where a rotated symbol is required.
This tutorial covers adding XY data to ArcGIS, so that you can view and work with the data in ArcGIS. By XY data I mean point data such as foliation that has a spatial (XY) component associated with it.
https://koordinates.com/ is a website that allows users and data suppliers to upload/download data with a spatial component. The advantage this site has over other data repositories is that the user can choose which data they like, which format, and over which area in a granular way. It also has a very good interface for viewing data/metadata.
These sites are powered by koordinates.