I do not think it is possible for a website or app to steal your keyboard information, except your device has previously been infected by a malware or virus. The screen resolution could be used by some sites to bring up pop ups in awkward positions (and make the option to cancel so small), where one can easily click to accept some random suggestion mistakenly as they would by clicking with their fingers.
Not exposing your device to random sites is wise and something I also apply in my dealings with gambling websites.
- Jay -
The keylogger can be installed in your system through some ways but not solely by visiting any site until you click on some phising links but the thing for safety is never store your sensitive information on your device connected to internet.For safety store funds on airgapped devices if possible but you should visit the sites you trust and that also through orginal link as there some scam clone sites for it also.