Important Documentation & Download Links

Product documentation links

SQL Server product documentation (with links back to SQL Server 2005)
(always look for the “What’s New” section when a new version arrives)

Transact-SQL Reference (Database Engine)

SQL Server product homepage

Features Supported by the Editions of SQL Server

Hardware and Software Requirements for Installing SQL Server

Power BI product documentation

See also: Microsoft SQL Server Version List
(“Lists all of the know Service Packs, Cumulative Updates, Patches, Hotfixes, and
other builds of SQL Server back to SQL Server 6.0)

SQL Server and related download links
(including Reporting Services / SSRS)

SQL Server 2019 Developer Edition download (and Express Edition)

Microsoft® SQL Server® 2017 Feature Pack

SQL Server Management Studio download. Latest version, 18.9.1. And Azure Data Studio is now automatically installed alongside.

SQL Server Reporting Services

SSRS 2019SSRS 2017

SQL Server Mobile Report Publisher download

Microsoft Report Builder

AdventureWorks sample databases

Wide World Importers sample database v1.0

Microsoft Contoso BI Demo Dataset for Retail Industry
(published 2010, .bak and .abf files; lots of rows too)
A fictitious retail demo dataset used for presenting Microsoft Business Intelligence products.

See also Jeremy Kadlec’s “SQL Server Download Quick Links” found at MSSQLTips

Power BI download links

Power BI Desktop (updates released almost monthly)

Power BI Report Server (as of this link, May 2020, but an updated version is released about every 3-4 months)

Power BI Gateway Standard Mode Personal Mode

Power BI Helper

DAX Studio

Other download links

Visual Studio downloads and homepage
What about SQL Server Data Tools (SSDT) for Visual Studio?

Azure Feature Pack for Integration Services (SSIS)

Azure Data Studio download

Azure Storage Explorer

Adventureworks sample databases (GitHub)

WideWorldImporters sample databases (quite a number of resources, on GitHub)