What feature in Google Scholar articles will be most helpful in determining if the source is going to be useful to you with your research?

the abstract
the title
the publication/journal title
the date of publication

All of the mentioned features in Google Scholar articles can be helpful in determining the usefulness of a source for your research. However, the most helpful feature in this regard would likely be the abstract.

The abstract provides a concise summary of the article's main points, research objectives, methodology, and conclusions. By reading the abstract, you can quickly evaluate if the article is relevant to your research topic and whether it covers the specific aspects you are interested in. This helps you in deciding whether to invest more time in reading the full article.

While the title can give you an initial clue about the subject matter, it may not provide enough information to assess the relevance of an article on its own. Similarly, the publication/journal title can hint at the quality of the source, but it does not provide specific insights into the content of the article or its suitability for your research. The date of publication is important for determining the recency of the research, but it alone does not guarantee the usefulness of an article.