You need to learn responsive web design, you can’t just add the meta tag and expect your website to turn mobile friendly (I know, it’s disappointing). You have to add media queries and use vh, vw, rem, and percents when necessary. Freecodecamp has a great course of responsive web design. Make sure you keep that meta tag, or otherwise media queries won’t work on other devices.
And please make sure you search for an answer before posting a question, else you will get downvotes