Do the free ribosomes do the same thing as the ones on the endoplasmic reticullum

or do they have different functions?

Also a cell does export protein right? but why? and where does the protein go?

Hi again! And essentially yes. Ribosomes all take mRNA and use it to TRANSCRIBE it into a protein. The bound ones will then send the protein directly to the ER for modification/ packaging. They can differ a bit in the types of proteins they will make for a cell, but it depends on the cell.

Some cells to export protein constantly, some not really at all.

For example, pancreas cells are going to make lots of insulin for transport into blood stream. Muscle cells generally make protein to maintain muscle fiber itself, so it's not really exported by used by the cell itself. White blood cells can make surface proteins that stick through the cell membrane for recognition of foreign bodies (like viruses).

Many proteins are enzymes used by the cell for its own functioning.

Ribosomes do not transcribe mRNA into protein. Transcription is the process of using a DNA template to create RNA. The act of the ribosome using mRNA as instructions to put a string of amino acids together is called translation.

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basically the same thing, that is to make proteins. however, those ribosomes on the ER make proteins that are meant for export out of the cell while free ribosomes make proteins for the cell itself to use.

and yes, a cell does export proteins. most of the cells in our body are specialised, meaning they have a certain function, for example brain cells are for storing information while cells in your digestive system produces digestive juices to break down food. One very good example will be the cells that produce enzymes, which are proteins in nature, to digest food in the alimentary canal because it is not possible for food to be absorbed into the body without being broken down.