New user to Onivim, getting started is not easy

So, I actually got my Onivim License Key a while back.
Am a Vim user for about 4 years.
For me it was never ready enough for getting actual work done.

I have now decided to try and give it a try again.

I am struggling with some very basic stuff.
And the biggest issue is that I cant find anything in the documentation to help me with that.

Setup:
fresh installation on windows.
trying to work on current projects in C++, and some files in Lua.

Issues I have:

1. gt and gT dose not work.
   how the @#$ do I move around the tabs?
   also :ls dose not do anything and :tabNext dose not seems to work.

2. I have set “ignorecase” and “smartcase”. however, when in the file browser, It has no effect.
   must use case sensitive search when looking for files.

3. I cant install ctags/Exuberant ctags.
   searching in the Extention tabs shows no results

4. language/project tools:
   gd dose not work.

CTRL-] work if the definition is on the same line.
if the symbol is defined on a different file, the file will be opened, but I will be taken to the beginning of the file and not to the actual definition of the symbol.

5. the outline in the file browser is empty.

6. no smart auto complete or anything like that.
   should I install an extension for this to work?

If anyone has any tips for me to overcome these issues I will be very greatfull.

Thanks!