Forecast creation of lists
To create lists, the most recent version of Google Maps should be installed on your iPhone or iPad. At least version 4.28 is needed for the feature. (Currently: Version 4.46, as of: 6.3.18)
How to Create Lists in Google Maps
Grab your iPhone and open the "Google Maps" app. At the top left of the search bar, touch the three-line icon to bring up the menu. Then select "My Places" and then "Saved". Now tap the "+" symbol in the lower right to add a new list. Enter a name and any description for the list, and then tap Save.
To add locations to lists in Google Maps
Search for a place using the search box or hold your finger briefly on a point on the map to place a marker. At the bottom of the screen you can see more information. Touch it. Now tap on the memory symbol. Select a list or create a new one with a tap on "New List".
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How to Manage Your Lists in Google Maps
Grab your iPhone and open the "Google Maps" app. At the top left of the search bar, touch the three-line icon to bring up the menu. Then select "My Places" and then "Saved". Next to the list you want, tap the three vertical dots to get more options. Here you can hide the locations on the map, edit the list, share, delete or manage the sharing options.