SAS official training class notes is a good introductory book. The above examples and exercises are simple and practical, and can be done step by step:

SAS(R) programming 1: basics

SAS(R) Programming 2: Data Manipulation Technology

The above two books are the contents of SAS certification base.

Little SAS book is also the official book of SAS, covering a comprehensive range. It may not be suitable for step-by-step reading, but you can always find relevant parts in it if necessary. For getting started, you still need to know the simple process of data and the most basic import, export and processing, generally not involving SQL and macros.

In addition, you can search online for documents related to statements or functions, which are usually one or two pages, which is very practical and contains simple examples. For example, Google: SAS+set can search related documents.