How do I import contacts from Excel to a SharePoint list?

You can export data from an Excel table to a SharePoint list. When you export the list, Excel will create a new SharePoint list on the site. You can then work with the data on the site, just like you would for any other SharePoint list. Note that Exporting a table as a list does not create a data connection to the SharePoint list. If you were to update the table in Excel after exporting it, the updates will not be reflected in the SharePoint list.

You may also find this Microsoft guide useful.