Advice On Buying New Gear System.

Hello everyone.
I'm constantly asking for help on this forum because I'm kinda clueless when it comes to fixing up bikes. I'll keep it short and simple however.
I've got a Boardman Mountain Comp 2016, I love the bike. But I don't like the brakes or the gear system so much. Brakes could have more power and the gears could be smoother. It's an SRAM X5 and an Avid DB1.
I am currently looking to upgrade the both of them however. But I don't know what to look for.
My question is whether every sort of gear system would be compatible with my bike or would I have to look for a particular system, same goes for the brakes. Also if anyone could recommend any parts I would appreciate it greatly.
I'm looking to replace the entire thing, so gears, cartridge, the cranks and everything literally. Also same goes for the brakes and rotor.
Everyone's replies are massively appreciated.
I'm constantly asking for help on this forum because I'm kinda clueless when it comes to fixing up bikes. I'll keep it short and simple however.
I've got a Boardman Mountain Comp 2016, I love the bike. But I don't like the brakes or the gear system so much. Brakes could have more power and the gears could be smoother. It's an SRAM X5 and an Avid DB1.
I am currently looking to upgrade the both of them however. But I don't know what to look for.
My question is whether every sort of gear system would be compatible with my bike or would I have to look for a particular system, same goes for the brakes. Also if anyone could recommend any parts I would appreciate it greatly.
I'm looking to replace the entire thing, so gears, cartridge, the cranks and everything literally. Also same goes for the brakes and rotor.
Everyone's replies are massively appreciated.

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There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
I don't need anything too fancy, just a decent system which would be suitable for light trail use. Maybe like £300-£400? Also would £100 for a brake system be reasonable? Many thanks.
Would you recommend anywhere where I could learn how to do bike maintenance? I've tried looking but found nothing too useful to myself.
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
I found SRAM NX to be a brilliant budget set up. Heavier than the pricey options from SRAM but nice and reliable.
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build
e.g. I've got SRAM X5 on my bike and they're fine. Quiet, trouble free, easy to shift. I'm sure there are better items out there, but changing them would really do nothing other than offer me an excuse to fettle with the bike for an hour or so (which I might quite enjoy), but in the end I'd still go up and down gears without issue.
Now, if I wanted to go 1x?? that would be different.
As for brakes, I did swap mine - went from cable discs which I just never got the hang of adjusting, to hydraulics which I've had as "fit and forget" items. But I got those front and back for £30 so it was a bit of a no-brainer.
Of course, there's no reason not to spend your own money...
2011 Specialized Hardrock Sport Disc (son #3s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
That 1x speed is a big thing for me, the 2x speed system has caused me only problems so far. Other than that the gear system is okay, transitions in the end but not so smooth and not so quiet.
Just convert your existing setup to 1x with a narrow wide ring and a wide ramnge cassette, but if you really want new parts look at the SLX 1x groupset on chainreaction, my mate got his for about £250. Shifter, mech, cassette, cranks and ring and chain.
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build