The DataSelf Training pages and other sections of this knowledge base cover a number of Tableau topics. Some of them are highlighted here.
Setting up a landing page How to configure your site your way
Select multiple records on a report to see the combined total How to select the information you want
Pages about Ask Data, Tableau’s Natural Language Query (NQL) feature Tableau Ask Data / NLQ
Exporting data from Tableau in .csv format - suitable for Excel.
Web Report Designer - web-based tool for report, dashboard and KPI design. Orange Belt: Web Report Design