This applies to Moodle 3.6 from July 2019 onward
This page will show you how to use Choice activities, which can be used for a simple poll, registering an interest or signing up for an option.
A Choice activity can be used for a simple poll or for registering an interest or signing up for an option. Be aware that it works on a first-come first-served basis. Alternatively you can use the Vote activity or the Allocation Form activity (see links to help pages on these below).
Limit (under Options in settings) can be useful when using for sign-up against a selection of essay titles or tutorial groups. You then set the limit against each individual option.
Availablity of results can be adjusted in terms of if they are published. If you choose for results to be published, there are further options to anonymise these.