What is ablution(ghosl-Religious bath) and what does it

We have narratives, if the house is where the person having sex had it. The angels do not enter the house until this person performs the ablution for cleansing.
A Muslim must intend for every religious act, which he does for the pleasure of God.
The ablution is usually done in two ways:
First method is Sequence: Wash the head first, then wash the right side of the body and then the left side of the body.
The second method is dipping(Ertemasy). After intent, the whole body goes into the water. Like a dive in the water. For a moment, the body should not be in contact with any place.