Indian cultural history is rich and deep, with evolving religious roots spanning from today to least 3,000 years prior to the common era (CE) (4) or more (5). The word "Hinduism" is actually a name created by other people outside of India, so I will refer to the practices of the Indian people by what they called their way of life since at least Vedic times: Sanatana Dharma or Sanatan Dharma. Similar to the Christian, Muslim, and Jewish religions, Sanatana Dharma in Vedic texts had one G-d; the Vedic neutral-gendered name for the big oneness -- which is everything, unmanifest and all manifestations including deities, us, animals, plants, rocks, space, time, ideas, etc.-- Brahman. We are each part of Brahman; Atman, our individual being transcends time and even this life within Sanatana Dharma. There are many ways to understand this big oneness, as in the metaphor of the blind ones each describing a different part of the elephant and all being right about their part. What we experience and how we contextualize reality depends upon our position. For example, some prefer to access the oneness as Shakti (female), whereas others choose different aspects on which to focus. In addition to Sanatana Dharma or Hinduism, there are other religions that also embrace various forms of dharma that include Jainism, Buddhism, Sikhism (see this cool map).
Today those who practice Sanatana Dharma seldom exclusively venerate Brahman or even Brahma (the personified form); instead there are diverse personal, family, local, and regional traditions and ways to practice that are alive and evolving (see Hugging Saint) including Shaivism (focus on Shiva), Vaishnavism (focus on Vishnu, including Radha/Krishna, 1 of Vishnu's 10 main incarnations), Shaktism (focus on the goddess), the Trimurti (Brahma, Vishnu, Shiva), and Smartism (Vishnu, Shiva, Shakti, Ganesha, Surya, or any other that is meaningful to you).
As a child I read about the practice of Sanatana Dharma, learned, and began to meditate. Then in college I studied primary sources in translation and began to practice yoga, ecstatic dance, and lucid dreaming. During my active frontline service work I was inspired to add learning about mudras (hand gestures). Now I am continuing to learn and apply what I learn by making yantras.
Over time the practice of Sanatana Dharma has evolved to include seemingly infinite applications and so many levels that it seems fractal. I must acknowledge that, like any study of another culture or even specific aspects of one's own culture, no matter how deep my academic knowledge, not having been raised in the culture, I will never fully understand. Please forgive my ignorance; do email me comments and corrections.