Q:

how to upgrade the sitecore packages from 9.2 to 9.3 using nuget

I am a newbie in sitecore.  I have install sitecore Version 9.3 and I have the visual studio solution file with version 9.2(it contains sitecore 9.2 pacakges) i need to upgrade all the dependecy package from 9.2 to 9.3 using nuget or nuget console. 

A:

Firstly you need to add NuGet feed for Sitecore 9.3
Install-Package Sitecore -Version 9.3.0 -Source https://sitecore.myget.org/F/sc-packages/api/v3/index.json

Then you need to go Manage Nuget Package and search DLL name then click on update

If you want to update multiple projects, then click on "Manage Nuget Packages for solution" and type dll name and check which project you want to update.