G'day. I'm a terrible Mac user. Really finding it difficult to adjust with lot of Mac stuffs as Windows user. Would be grateful if you could answer whether two of my problems below can be solved with any applications available for Mac. App to lock MacBook to compensate for Windows's instant system lock with a keyboard shortcut (Windows Key + L) instead of putting the computer to sleep as with the case of MacBooks. I know mostly anything as such won't be there for Mac but as a workaround, an app which can blank the screen or put the Mac in some sort of screensaver mode and locks the system which can be disabled up by a key press/shortcut and then the system lock screen appears to unlock the computer. App Locker for Mac which locks the individual apps as it's with Android.