How to fix problems related to laptops

Product Name: Hp pavilion 15 au114tx

Operating System: Microsoft Windows 10 (64-bit)

I have Hp Pavilion au114tx and I'm facing some disturbance LIKE : -

1... I have to play games while charging only(needs power Supply)OTHERWISE GAMES LAG ,

2...It says 9 hours backup but I get 4 hrs (I used to download all night that too disconnecting all USB plugs and on 0% brightness), and

3.... if I let my laptop turned on(working condition) with Charing on all night it stopped working and only blank screen shows (I saw this when I used to charge all night and in the morning the screen gets black and laptop is not working) so I have to long press the power button and restart it. And

4...During playing games, some key combinations were pressed by mistake and laptop responds like if I press E it will open explorer for R (command box) it's like shortcuts without pressing windows key at that time all buttons works as win key + "key I press" this can undone by exactly what? I restart it or... Cross Check keyboard settings or try to make key combinations to make it settle... And

5...also its boot time is about 2 minutes that is why I use hibernate option to work faster and easier, overall laptop is awesome just the slowness sucks a lot,

6...it's bios is Locked and I want to install /try live Linux on it...

Please answer my all questions... Because these are the only ones I badly wanted to know.