You are what you think. So it’s good to think about God all the time. You can realize your identity with God that way. Thinking about the formless Absolute is difficult though, so one technique is to choose a form and approach.
Ganesha is for those who want to approach God as a friend, a buddy. He’s like the neighbor kid down the street who stops by for sweets and to play. For mothers Ganesha is like a child. As the Devi’s first born son, He got the privelege of first worship at temples and before rituals. He is God of beginnings and obstacle removal—gatekeeper to Sanatana Dharma, so make friends and He’ll let you in.
If your interested in practical spirituality and a real connection with God, Ganesh can get the party started.