Not always highlight and autofill

Hello, I am new coding and I was trying to crate a player that moves up, down, left and right. Watching tutorials I found that coding the script people can autofill the words with tab but there are some words that they can and I can't . Here's a screenshot of what I mean:
-The tutorial:






-Me:


Some of them aren't even highlighted or the same colour .
I'm sorry If it is pretty dumb, I'm a begginer

 

This may help you with intellisense problems:

https://forum.unity.com/threads/intellisense-not-working-with-visual-studio-fix.836599/

Also, try update the VSCode package inside of Unity: Window -> Package Manager -> Search for Visual Studio Code Editor -> Press the Update button

Also, this: https://forum.unity.com/threads/no-suggestions-in-vscode.955197/#post-6227874

 

Thanks a lot! I also found a video which solved the problem (

)