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Talk groups are those neat places that you would like to talk in. A few popular ones are World Wide TG/DMR ID 1 and Tac310 with TG/DMR ID 310. Most of your inputs will be Group Call. When inputting a group, their ID goes under TG/DMR ID and under name use a descriptive name for that will show on your radio. I would only input 2 or 3 to get started before you add all the groups you want.
Some places for more info and finding talkgroups:
http://www.dmr-marc.net/FAQ/TG.html
Here is a spot where you can go to search for what groups are in the area you want.
then click the database link then dmr reapeater ID list
On the search page put the state or city in and click search. On the list click details to see if there is additional information.