to the new modern television, which can be installed (i guess you mean the application or softwares for viewing films, but you cannot install TV on mobile, yes you can install softwares in mobile phones)
Educational aspect of it which includes entertainment.
of it which includes entertainment(makes this clause vague.)
One major disadvantage of these that seems to me can be a serious one is wasting of time. (add a cohesive device in this sentence.)
that seems to me can be ( you sound like unsure what you are trying to argue. Rather you should use bold tone to take a stand)
that I mention in the first paragraph (wordiness should be avoided,)
First, (Comma missing)
ThroughBy watching movies
,the countries ( try to be specific which countries or use many countries.)
their heroes
I n addition
by watching movies in English for example ( rephrase like "
by watching english movies some people can improve our language skills" )
Each movie
tries to
a point such as good ways about (no need of this phrase)
how to behave in certain situations(some especial behavior. ( be specific which especial behaviour).