Datastore2 Saving Multiple Values with Each Key Performance

I am having a hard time understanding tables of Datastore2 and can’t find any simple tutorial online that will explain how to get, modify and save the table properly. Now, I want to ask if I would to save 30 values, is there much a difference with saving these 30 values with each key (30 keys and combine it using Datastore2. Combine) compared to saving all these values in a table (not sure if saving these 30 values in a table will be just 1 key)? I am already familliar with saving values with each key in a DataStore2.Combine but not with tables. Also, what are the cons and pros if I would save 30 multiple values with each key? I am more into keeping the data saved and avoid any data loss. Hoping somebody will enlighten me. Thanks.