Ganesh as God of beginning

 Before starting any work , we worship and pray to God Ganesh that

 everything must go smooth . God Ganesh is hailed as " God of beginning " .

Once God Vishnu was getting married in heaven . Each and every God is

 invited to attend the marriage . But if everyone leaves , heaven will be

 empty . Demons are waiting to invade heaven . It is not safe to leave the

 heaven empty . So all the Gods requested Ganesh to guard the heaven when

 they are away .

Ganesh happily agreed . All the other gods left to attend the marriage . That

 time sage Narada observed that Ganesh is all alone in heaven and he came

 near Ganesh and asked for the reason for not attending marriage .

Ganesh said he has been asked to guard the heaven against any attack of

 intruders . That time , Narada revealed the true reason behind this . As

 Ganesh is fat and known to eat large amount of food , he was left out from

 coming to marriage .

This made Ganesh very angry . He ordered his army of mice to dig the earth

 and to make it hollow . Because of this , vehicles of Gods who were heading

 to attend the function could not proceed further as wheels of vehicles got

 stuck in the ground .

No God was able to lift the vehicle which got stuck . Finally they requested a

 passerby to help them .  He prayed to God Ganesh first and then he could

 easily lifted the vehicles .

By this time , gods have understood their mistake . They asked for the

 apology with God Ganesh and took him with them to wedding . That's why

 we pray to God Ganesh before doing any work that everything must go

 without any problem .