Since the beloved MonoDevelop is no longer supported in version 18, you will have to use VS. Everything will be fine, but there are no tips like in mono, or rather there are but there are no unit commands (Time, touch, PlayerPrefs and everything else), how to enable them? They are not in VS code either.
Everything is simple to the point of banality, just install extensions for Visual Studio for this, click:
Tools -> Extensions and Updates… (Tools -> Extensions and Updates..)
In the window that appears, type in Unity in the search engine.
Install extension. (Visual Studio 2017 Tools for Unity)
But in theory, everything should work without it, it seems.