Well completion-ignore-case is enough to solve this particular problem, the other options are just sugar on top :)

I'm going to add completion-prefix-display-length to these related bonus tips (I have it set to 9). This makes it a lot easier to compare files with long names in your tab completion.

For example if you have a folder with these files:

FoobarSystem-v20.69.11-CrashLog2022-12-22 FoobarSystem-v20.69.11.config FoobarSystem-v20.69.12 FoobarSystem-v20.69.12-CrashLog2023-10-02 FoobarSystem-v20.69.12.config FoobarSystem-v20.69.12.userprofiles

Just type vim TAB to see

 ...1-CrashLog2022-12-22   ...1.config   ...2   ...2-CrashLog2023-10-02   ...2.config   ...2.userprofiles
$vim FoobarSystem-v20.69.1

GNU Readline (which is what Bash uses for input) has a lot of options (e.g. making it behave like vim), and your settings are also used in any other programs that use it for their CLI which is a nice bonus. The config file is ~/.inputrc and you'd enable the above mentioned options like this

$include /etc/inputrc

set completion-ignore-case on
set show-all-if-ambiguous on
set completion-map-case on
set completion-prefix-display-length 9