Once the Import mode is active, you can import from multiple memory cards at the same time. I won't go over all the settings in the Import mode, but I do want to point out one lesser-known tip. Invoke the standard import method via the Import Photos and Video menu under the File menu, by pressing Ctrl+Shift+i on Windows and Command+Shift+i on MacOS, or by clicking the Import button in the lower-left corner of the Library module. The standard import method is perhaps the most used method for importing photos I use it for most of my imports. If you're a Lightroom Classic user, this is probably the method you learned first and probably still use the most. If files are consistently in known locations, getting them in and out of Lightroom can be a breeze. The method you use for importing not only can speed things up, but it can also help with your organization strategy. Whether it's importing from a catalog that someone sent you to tethering for a client, the faster you get your files into Lightroom, the sooner you'll be able to edit them. You may not need any of these other import methods now, but it's always good to at least know that they exist just in case you have the need later.
These differing import methods each have their benefits and limitations, but most importantly, they help you work in a way that is best for your workflow. Lightroom Classic is one of those in that it has various ways to import files.
One of the attributes of great software is that it has multiple ways to accomplish a single task.