I do use 16.0.1 downloaded inside IntelliJ.

same for me EXC_CORPSE_NOTIFY Application Specific Information: ProductBuildVersion: 12E262 ASSERTION FAILURE in /Library/Caches/com.apple.xbs/Sources/DVTFrameworks/DVTFrameworks-18168/DVTITunesSoftwareServiceFoundation/App Loader/Wrappers/DVTITunesConnectApplicationVersionDescription.m:70 Details: (y) should not be nil. Object: DVTITunesConnectApplicationVersionDescription: 0x7fb2b6570340 Method: -initWithCoder: Thread: NSThread: 0x7fb3225777a0{number = 27, name = (null)} Open FDs: 55/7168 Hints: Backtrace: 0 -[IDEAssertionHandler handleFailureInMethod:object:fileName:lineNumber:assertionSignature:messageFormat:arguments:] (in IDEKit) 1 _DVTAssertionHandler (in DVTFoundation)

previous link is broken  macOS Big Sur 11 Beta 3 Release Notesfor 62986286. any other info available? THX

Apart form very good Apple materials, I onesti think without a serious CS college course. the task is vey hard: too many concepts You can only undestand after a graduation.