What is the first step to import external data into an Excel file?

The first step to import external data into an Excel file is to use the option that specifically addresses bringing in data from external sources. This option allows users to choose the type of external data they wish to import, whether it is from a file, database, or online source. Selecting this option will lead you through the necessary prompts to connect to external data, specifying the desired format and location of that data.

Accessing the file menu does not directly lead to the option for importing data, as this menu primarily contains options related to file operations like saving and printing. Reviewing existing comments is unrelated to the data import process, as it deals with feedback and annotations within a spreadsheet. Adjusting cell formats pertains to the visual presentation of data already in the spreadsheet, not the initial action of bringing in new data. Therefore, utilizing the specific feature designed for external data import is the proper first step.