Your brain is like a blob of jelly, it floats around inside your skull.
When you impact your head the effect is, that the brain will bounce backwards from impact point and impact again at the opposite side of the skull.
As per the universal laws of motion; when the skull stops suddenly, the brain continues forth having its own collision within the skull.
Obviously get the best helmet for you that you can afford with approved safety ratings, no helmet will make a difference to brain to skull impact, although some helmet liners are designed to slow the skull/brain impact down - and a good 'shell' can absorb some physical impact, and could prevent your head being intruded by pointy things.
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