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What are your questions?

  1. I have noticed that after a short period of buying an bitusd there is a settle time and i can't understand what that means.
  2. Do we gain any dividend by holding bit assets ?

The following link describes bit assets best:
https://bitshares.org/technology/price-stable-cryptocurrencies/

Look at the "Introducing SmartCoins" and "the Long (BitUSD holder)" sections.
You can typically sell your BitUSD on the open market for about a dollar or slightly above. If liquidity is poor you can force settle for $1.00 and this will take an hour or less to perform.

There are several bit Assets that offer returns.

Thank you :)

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