Overview
You can create a custom, easier to remember meeting link and assign it for all your meeting sessions. That way students/meeting guests are able to always use the same link to join your sessions and you don't have to send it out every time.
Login to your account
Go to https://www.zoom.us/ in your web browser and select "Sign In". be sure to use the same account info you did when you signed up originally. If you use gmail to authenticate click the "Sign in with Google" button lower on the page. Once you are logged in click on the "Profile" link on the lefthand side of the page. You can now click "Customize" to edit your "Personal Link"
Set your personal link to something that makes sense for your class.
Scheduling your sessions
In order for the link to work you will have to be sure to use your "Personal Meeting ID" when scheduling the meeting. If you choose Generate Automatically the customized link will not work.
You can now send the customized link out for anyone to join your scheduled zoom sessions.