Settings, windows 10, Connect automatically when in range versus Connect automatically in Available

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HP laptop 15-da0xxx
windows version 21H1, build 19042.985
Processor Intel(R) Core(TM) i3-7100U CPU @ 2.40GHz 2.40 GHz
Installed RAM 16.0 GB
Product ID 00325-81103-90601-AAOEM
System type 64-bit operating system, x64-based processor

I have a "sometimes" working wi fi network whose intermittent failure I was blaming on my ISP. I've since found out my switch settings in "Settings" Windows 10, are at fault.Or Windows 10 is at fault. I'm not sure which, if either. I am relatively new to windows10, my last O.S. was Windows 98. Which brings up another problem for me. I am not familar with previous versions of windows, ie Windows 7 or 8 or 8.1. Therefore I do not understand these references, and in my opinion, (far too often used references.) I have used Windows version 3.1 through Windows 98. (Including the infamous "milleneum" version) to show my loyalties. But I have Seriously considered switching to a different O.S. since the inception of Windows 10.
Can someone explain the purposes of the two capabilities in "Settings" to connect automatically. One in "Available Networks" (Actually,) the first one is a box to put a check mark in "in Available Networks" and is labled "Connect Automically" The second is labeled "Connect automatically when in range" To get there, click> Network and Internet in Settings. Click > wi fi in the left panel and then click> the name of your network (at the top of the page or click the "properties" & it should take you to the page in Settings that shows the "Connect Automatically When In Range" switch displayed at the top of the page right under your Network name and also below the verbiage for the switch. Then when I turn "OFF" "Connect Automatically when in range" My connection to the Internet disconnects. Should this switch be "ON" or"OFF" when I want to connect to the Internet? What besides the obvious self-explanatory names explains the use of these two capabilities in relation to each other? I've read many, many articles and forum replies. but no explanations that I can find !! Where is the explanation, Please ? and what are the functions of these two capabilities? I have seriously researched this subject to no avail. This brings on a lot of frustration, on my part which is directed at Windows10.