How to 'cycle' the fish tank?

Kuromi

New member
I've read and read about it. but i dont get some things.
What happens if I dont cycle it first?
And what kind of fish do I use during the cycling process?
A step by step guide would be helpful and do I condition the water for the cycling?
So do i condition the tap water before putting it in the tank for the filtering? And how do i test it for ph , hardness, nitrates and whatever else needs to be measured?
 
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