This module will help you to enter the latitude / longitude coordinates in a Geofield field.
Must be installed with Composer as a library comes along.
At the settings of the module you tick which services (= type of cards) you want to use.
With some you have to fill in extra information. Eg the Googlemap key if you want to use this.
At the settings of the Geofield field, you now indicate that you want to be helped by Geocode. You also indicate which field you want as 'helper'. Here I choose the title field but it can also be an address field or just another text field.
Now the Geocoder is going to do its job. You fill in the title (= my chosen help field) and you leave the Geofield empty. When you save, the miracle happens ...
Also works with PIO (places of Interest)