Folders that start with a dot are hidden by default, thats why to create them you have to use Terminal.
~ is a shortcut that refers to your home folder. When you start Terminal, you should by default be in your home folder, this is indicated in the prompt, which should have a tilde (~) then a % sign as the input prompt. If you enter the command pwd it will return your location (pwd = print working directory) so you can always check that, if you've cd'd (changed directories) into another location.
eg.
cd / - your location moves to the root of the filesystem. pwd returns /.
cd ~ - your location moves to your home folder. pwd returns /Users/<your login name>
Thank you VKD for your help. When I try to run Quake II I get an error message. Is this something you understand:
Process: quake2 [35971]
Path: /Users/USER/*/yquake2.app/Contents/MacOS/quake2
Identifier: com.macsourceports.yquake2
Version: 8.10 (8.10)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: quake2 [35971]
User ID: 501
Date/Time: 2022-10-01 21:41:15.138 +0200
OS Version: Mac OS X 10.14.6 (18G9323)
Report Version: 12
Anonymous UUID: 502ECCFC-31EE-A57E-CA02-ED315A37943B
Sleep/Wake UUID: 3AA3B848-FCDF-4D30-A97C-93FDDAD38AC8
Time Awake Since Boot: 270000 seconds
Time Since Wake: 2600 seconds
System Integrity Protection: disabled
Crashed Thread: 0
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: DYLD, [0x1] Library missing
Application Specific Information:
dyld: launch, loading dependent libraries
Dyld Error Message:
Library not loaded: @executable_path/libs-x86_64/libSDL2-2.0.0.dylib
Referenced from: /Users/USER/*/yquake2.app/Contents/MacOS/quake2
Reason: no suitable image found. Did find:
/Users/freddie/.yq2/yquake2.app/Contents/MacOS/libs-x86_64/libSDL2-2.0.0.dylib: cannot load 'libSDL2-2.0.0.dylib' (load command 0x80000034 is unknown)
/Users/freddie/.yq2/yquake2.app/Contents/MacOS/libs-x86_64/libSDL2-2.0.0.dylib: stat() failed with errno=1
/Users/freddie/.yq2/yquake2.app/Contents/MacOS/libs-x86_64/libSDL2-2.0.0.dylib: cannot load 'libSDL2-2.0.0.dylib' (load command 0x80000034 is unknown)
/Users/freddie/.yq2/yquake2.app/Contents/MacOS/libs-x86_64/libSDL2-2.0.0.dylib: stat() failed with errno=1
Binary Images:
0x105562000 - 0x105625fff +com.macsourceports.yquake2 (8.10 - 8.10) <B2DD7062-338D-3D20-8C71-C6582AA1495D> /Users/USER/*/yquake2.app/Contents/MacOS/quake2
0x10978c000 - 0x1097f670f dyld (655.1.1) <4842B61A-B868-3146-9CA9-5582C4198B25> /usr/lib/dyld
Model: MacBookPro11,1, BootROM 431.140.6.0.0, 2 processors, Intel Core i5, 2,6 GHz, 8 GB, SMC 2.16f68
Graphics: kHW_IntelIrisItem, Intel Iris, spdisplays_builtin
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463531323634485A2D314736453120
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463531323634485A2D314736453120
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x112), Broadcom BCM43xx 1.0 (7.77.61.3 AirPortDriverBrcmNIC-1305.12)
Bluetooth: Version 6.0.14d13, 3 services, 27 devices, 1 incoming serial ports
Network Service: 802.11ac WLAN Adapter, Ethernet, en4
Serial ATA Device: APPLE SSD SM0256F, 251 GB
USB Device: USB 3.0 Bus
USB Device: Apple Internal Keyboard / Trackpad
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Razer Viper Mini
USB Device: 802.11ac WLAN Adapter
Thunderbolt Bus: MacBook Pro, Apple Inc., 17.2