I have Visual Studio 2015 on Windows 10.
I Installed SQL Server Data tools (SSDT) 2016.
I want to run SQL Server Manager, but I didn't find it.
I Spent more than enough time in searching inside my system files and googling but I couldn't resolve the problem.
SqlServerManager13.msc (or any version of it e.g. - 12 / 11) does not exist in C:\Windows\SysWOW64\ or C:\Windows\Windows32 or C:\Windows.
Where can I find it?
It's not a standalone product but an add-in for Visual Studio. To access it, run Visual Studio, go to the View menu and select SQL Server Object Explorer.
The SQL Server Object Explorer in Visual Studio offers a view of your database objects similar to SQL Server Management Studio. SQL Server Object Explorer allows you to do light-duty database administration and design work. You can easily create, edit, rename and delete tables, stored procedures, types, and functions. You can also edit table data, compare schemas, or execute queries by using contextual menus right from the SQL Server Object Explorer.
For a more detailed description see SQL Server Data Tools.
YouTube tutorial here: Using SQL Server Data Tools SSDT