My suzuki Baleno the handbrake light comes on going around corners, and the check engine light comes on usually when I speed up

Check out the link for Suzuki handbrakes.

https://www.google.com/search?q=2018+suzuki+baleno+adjustment+handbrake

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1997 Suzuki Baleno
we dont have Baleno's here on this USA forum (and country)
so cant just look up you book , liker ours.
but the operators guide covers that. lost yours?

here is our.
https://suzukipitstopplus.com/Category/5-suzuki-owners-manuals.aspx

note how Baleno is missing, ? a USA pit stop.!
ask your local suzuki for the missing book, so next time you are ready?

did you open the hood yet and try to find the bulb socket
and lighting laws vary by country , some have auto aiming lights
and are different. (laws gov. these facts)

which engine.??? never post lacking engine ,here is why.
1.3 L G13B I4
1.5 L G15A I4
1.6 L G16B I4
1.8 L J18A I4
1.8 L BP-ZE I4
1.9 L XUD9 diesel I4

Ill answer in the generic and for GAS engines. only.
that is illegal RPM, the ECU regulates it to 800 all the time
that means the ECU can not regulate the RPM now, for many reasons.
and sure it vibrates too low, that is normal for all 4cylinders to do that.
no bad engine mounts never lower RPM to 600, ever.
they dont control idle speed at all.
the #1 reason for most cars to idle too low are:
1: EGR leaks, (clean it)
2: ISC stuck closed (electric idle speed acututor dirty) clean it.
3: gross misfiring , caused by bad spark or bad fuel mix.
4: low compression on 1 or more cylinders (real low) Do compression test at WOT. throttle.

see the steps and fix it. God bless you
When you turn the ignition ON before starting the car, the "Check engine" light is supposed to come on indicating that the engine computer (also could be called ECM, PCM, or ECU) is powered on. If the "Check engine" light does not come with the ignition ON, it's possible that there is no power coming to the engine computer (e.g., due to a broken wire, faulty main relay, burnt fuse, etc.) or that there is a problem with the engine computer itself.

Carbon build up on pistons raises engine compression.This is normal.Go up one grade on gas and/or put some fuel additive.If this doesnt solve it,have timing belt/chain inspected may need replaced

you probably need to check the butterfly. its the compinent that controls how much air goes into the engine if it is weared than in idle state air leaks into the engine sometime more sometimes less and cause fluctuations in rpm

secondly there is a rpm switch which controls the rpm you can replace that switch and check

i have a 2000 model suziki baleno when then car warms up the check engine light comes on and tries to stall and has no power the car has done 82000 klm

Check crank angle sensor. Mine run until warm, pinlks badly/stalls, engine check light then comes on a car runs ok. Ran diagnostic and came back with a faulty crank angle sensor

The problem is probably caused by moist in the fusebox / relaybox inside the cocpit. It's placed on the drivers side below the steering wheel. In my case it was sufficient to dry it by using a heater fan for couple of hours ( over night ). Afterwards I used CRC for electrical circuits, and sprayed everything as goods as possible. It has now been working fine for more than a year, so it might be worth trying.....