I’ve had to search for this one several times so putting it here so that it might make it stick or be easier to find.

Sometimes working with my pupils I want to send them to a blog, have them logged on but not go to the dashboard.

the login url has a redirect_to parameter.

So I I use a url like
blog-address/wp-login.php?redirect_to=page-I-want-the-pupil-to-go-to

Where blog-address is the blog I want them to log on to and page-I-want-the-pupil-to-go-to is a relative or full url

I often share notes to my class via AirDrop and hide long urls but typing a name, selecting it and making it a link, ⌘-k on mac. Unfortunalty you have to create linked text in another app on iOs and paste it in.