Mortal sins are committed deliberately and with knowledge of the offence, they are either offences to God by failing the first three commandments or offences to our neighbour by failing the remaining seven commandments.
Venial sins are light offences or daily faults mainly committed against charity.
They can be forgiven by an act of contrition, by the sign of the cross, by the reception of the Holy Eucharist but most surely by confession. This is why we must accept humbly that we are sinners, we must examine our consciences daily and ask the Lord to forgive us. Capital sins are mortal sins committed regularly without any remorse, they are associated with vices that oppose the virtues so necessary for our salvation. The seven capital sins are pride, avarice, envy, wrath, lust, gluttony, and sloth. They are true demons that guide the soul to perfection in some kind of evil, while they persuade them to commit other graver sins.