Why don't Eclipse shortcut keys (CTRL + space) work? - eclipse

When I installed Eclipse to write java programs, I found the feature of shortcut coding (CTRL + space) doesn't work popping up error message, giving that Eclipse version is Neon.3 Release (4.6.3)

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Content Assist (Ctrl + Space) Is not working for testNG.xml file in eclipse

Content Assist (Ctrl + Space) is not working in Eclipse IDE for testng.xml .
Eclipse Version: Photon Release (4.8.0)

my eclipse splits editor windows automatically, it's extremely annoying for me.

Does anybody know how to disable this auto-splitting?
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Eclipse IDE for Java Developers
Version: Oxygen.1a Release (4.7.1a)
"

Please see the image Windows==>Editor==>Toggle split Editor.

PyDev - in Eclipse Oxygen "show in System explorer" absent for Python project; available in Java Project

In Java project I can show anything in "System Explorer". Why for python project I cannot do the same?

Press ALT + SHIFT + W after select some file.

Eclipse Luna in fedora Os

Hi I am using eclipse luna in fedora Os. I want to change my redo action key binding from ctrl + shift + z to ctrl + y. So how to do it. i have tried to change it from windows preference menu but no got any result. I can't able to change there.

Change it in Windows > Preferences > General > Keys

Missing in Eclipse key shortcut as in Visual Studio to go to definition F12 and come back Ctrl+F12

Is in eclipse the keys like F12 or Ctrl+F12 like in visual Studio?
F12 goes to definition of function or variable
Ctrl+F12 come back
I am using eclipse Kepler and vs2010

You can use F3 to go to the definition and ALT + ← to go back. Tested in Eclipse Luna 4.4.1.