When I try to do css or html exercises, only some of them let me type.I can easily move forward in flexbox for example, but when I do CatApp in html and type in editor it repeats letters and wont let me delete
Are you trying to use it on mobile?
On both tablet and mobile
The site is not well optimised for mobile yet and has plenty of bugs like this.
It’s recommended that you use a computer / laptop with a browser like Chrome.