no
It is correct to say that Cydia is able for ios 7.1.1.
Some ios 6 devices can be jailbroken.
There is no Cydia for Mac OS X. Only jailbroken iOS devices are currently supported by Cydia.
There is no way
No. Cydia tweaks is fully updated for the ios 7 for apple.
There are no jailbreaking cydia tools for ios 11 or to ios 10.3.3 but there is and demo version trending around the world. try this steps and find out cydiadownload.info, i tried it and it was good but its still need some improvement.
Yes you can.
allows 3rd party applications, also considered hacks by some, that enable functionality Apple doesn't allow on the iOS platform
There are no jail-breaking tools for ios 10.3.3 but there is a demo version to jailbreak ios 10.3.3 but it still need lil bit of improvement. but overall the tool is very good. for your reference go to cydiajailbreak.info for more information.
Simply update ios
You can't. It's impossible unless somehow apple let's it into the app store.
To install Cydia, you typically need to jailbreak your iOS device using a compatible jailbreak tool for your device's iOS version. Once the jailbreak process is complete, Cydia will automatically be installed on your device. You can then open Cydia to download and manage third-party applications that are not available in the official App Store. Please note that jailbreaking can void warranties and may pose security risks.