Here's the explanation of all terms that are included in your Basic Excel Export table:
Time: Mention time of publish
Date: Mention date of publish
Source type: Source type
From: Publisher's username, channel or website
Author: Web source type: name indicated in the “author” tag on a webpage (if it exists). Other source types: username of the publisher
URL: Link to mention
Title: Mention title
Mention snippet: A chunk of text which contains a keyword
Group name: Query folder name
Keyword: Query name
Language: Detected language(s)
Locations: Detected Location(s)
Manual sentiment: Manually set sentiment
Auto sentiment: Detected sentiment
Reach: Reach of a mention
Virality: Virality of a mention
Influence score: Mention influence score