Many browsers already have a built-in feature to securely save your password. When you are acessing a secure system (like an app or website) you are most likely required to log in. To make the access easier, the system gives you a special token called a refresh token. These refresh tokens allow you to stay logged in without entering your credentials every time.
These refresh tokens are not valid forever, as this would be a security risk and therefore you need to login again, when the refresh token has expired. This is also the case when using My.AgroVision.
You can use the already built-in feature on your own device or you can use a password manager. A password manager is a separate app that stores all your credentials securely across devices. You can search, find and download a password manager through your browser.