Let's say I override my HDD 3 times

Let's say I override my HDD 3 times..
Could someone still recover it ?

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the HDD?

Yes.
You might need one of these

the stuff on the HDD
so its better to destroy it completely ?

Hard Disk Drive
Use BleachBit, it's like a cloth or something:
bleachbit.org/

smash it
destroy it
bury it
put it 5km underwater
send it to outerspace

Now just what needs hiding so bad, user?

unless you put it in a black hole there is a possibility if data recovery

actual picture of OP

Just do DBAN

Just remember to overwrite it with zeros afterwards.

Burning things tends to make them unrecoverable.

This. Burning things changes their chemical composition into carbon.

Do that three times, then burn it.
Just promise there isn't anything illegal on there.

not any regular attacker, and only national-security-level risks would warrant spending the money to do the insane magnetic forensics. unless you are a genuine threat to the national security of your country, you are (maybe) safe with zeroing once, and (probably) safe with a random pass and then a zero pass
skeptics.stackexchange.com/questions/13674/is-it-possible-to-recover-data-on-a-zeroed-hard-drive

Just write 0s on it.

that still keeps the data, it's in the system

dont forget to add tons of salt and corrosive acid on an oxygen rich environment

What system, your computer?

If you're seriously concerned about that level of secrecy, you'll need to grind the platters down to pieces about 3cm(mm?) in size. As per regulations for destruction of above top secret storage materials.

...

Just do 5 x 35 pass wipes bro, it'll kill the HDD too

Just open it and smash the platters, much faster!

this will do the trick.

The science behind how data recovery works is pretty schway.