I've started using SolidWorks migrating from other software, Creo Parametric (formerly Pro/E) and the Base/Boss terminology confused me. After significant research, I've found that a "base feature" represents the starting feature and a "boss feature" represents any features built off of that - http://help.solidworks.com/2020/english/solidworks/acadhelp/c_feature_based_models.htm.
However, through using SolidWorks 2020, and from many different tutorials, I have never been able to make the first feature a base feature, e.g. "Base-Extrude1", but rather it alway shows as a boss feature, e.g. "Boss-Extrude1". Has the "Extrude Base" been deprecated from SolidWorks and Extrudes are always boss extrudes now or am I just doing it wrong? Are there any differences in the Property Manager for base features vs boss features?