Visual studio is also known as vs code.
1. The best vs code extension is LiveServer by Ritwick Dey. It save your alot of time. This extension is enabled globally.You can download this extension for free open source, quick development Live Server with live browser reload, Shortcut key is to open live server is Alt + L + Alt + O.
2. Prettier is also a best extension in vs code extention list. which is used for code formatting. It automatically format your code after pressing the Ctrl+ S button. You can download it from vs code extension after searching Prettier - Code formatter by Prettier.