One of the tools available for Salesforce imports is the Data Import Wizard. This method of importing data is convenient because the import process is embedded directly within Salesforce - unlike Data Loader, no external applications are required for the data import process.
Instructions for using the Data Import Wizard can be found below:
https://help.salesforce.com/s/articleView?id=sf.import_with_data_import_wizard.htm&type=5