Hi, Hinduism and Buddhism are very different teachings.
For example, we do not believe in an eternal Soul/Atman/Self. We
also do not have concepts of a universal soul. Instead, Buddhism
teaches Anatta (no-self).
Unlike Hinduism, we do not worship gods nor believe in first cause,
but rather, we teach Dependent Origination and all as a process of
conditioned becoming without a beginning. However, it is possible
that one may attain Nirvana, through the ending of ignorance and
thus the absence of causes for future births. Nirvana is also the
highest bliss and the end of suffering.
In Hinduism, Moksha/liberation which is similarly seen as the
liberation from Samsara as Buddhism, is however, quite different.
Hindu's moksha is the union of Atman and Brahman or Godhead, or
realising the indivisibility of Atman and Brahman. In Buddhism,
Nirvana is not a matter of merging, or realising atman=brahman. It
is the realisation of reality as Dependent Origination, the 3
dharma seals (which includes 'No-Self'), luminous-emptiness
inseparable, that liberates.
In Hinduism, there is a caste system which separates the role of
the individual (some being outcastes, some being merchants, some
being kings, Brahmins, etc) at birth. But Buddha thinks this is
very unfair and often tells that it is the qualities of an
individual that makes him a 'true Brahmin'. He does not support the
caste system, and accepts disciples from all castes equally, even
the lowest castes.
Another difference is that all Hindu schools believe in the
authority of the scriptures of Veda, but the Buddha rejected this
authority and taught based solely on his own insights on reality
and experience. Our scriptures are totally a different set from the
Hindus.
It should also be noted that Buddha is not the incarnation of God
or gods like what the Hindus may think. The Buddha was not the
incarnation of God or a god -- he was an awakened being. All
Buddhists who practice the path of Buddha will also attain
Enlightenment/Awakening.
Here's just my summary... anyone who thinks of something else
please add on.