Have a look at the Permissions doc link I posted above. You'll see tables that show, for various tasks, what the minimum permissions required are, for the various parts (servers, libraries, folders, tables, reports, explorations etc) in order to be able to do that task. You will see that to view a report you only need RM for the report (and RM for the folders to be able to navigate to it). You need RM and R for the tables as the data source for the report. If you follow metadata security best practices, the required sets of permissions can flow consistently from standard ACTs applied to key objects/folders.
Those documentation tables are very useful. To confidently manage metadata security you will also need an understanding of identity hierarchies, object inheritance paths, conflict resolutions rules, and best practices. If you are not confident with those then I recommend reading the docs, attending the SAS Platform Administration Fast Track course, and reading best practice papers by the likes of @CecilyHoffritz & Johannes Jørgensen, @DavidStern, and @angieh. There are also a couple of webinars on metadata security best practices coming up soon: Angie Hedberg and @MichelleHomes are doing one this week - see https://www.sas.com/en_us/events/users-groups/17q3/security-best-practices.html and David Stern and I are also doing one in October - see https://www.sas.com/en_gb/events/2017/user-webinars/security-model-designs.html
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