christmas custom around the world ( or christmas traditions)( for correction)

I would like to write about Christmas it is a magical season, When people hear the word CHRISTMAS they think about Santa Claus, Turkey, Christmas Tree ( Pine) , fairy lights (if the lights are out for Christmas, they're commonly known as Christmas lights. Fairy lights are year-round), tile(?), wrapping paper, tinsel, mistletoe , christmas carol( that is different to Christmas song), reindeer, snow and maybe if you are christian you celebrated the birth of Jesus ( Jesuschrist). But in some countries like South America we don't have winter season and therefore we don't have snow, or Pines growing in my city, for that reason we have to know the Christmas become traditions(?) in marketing (I don't understand) people around the world have the american idea and we change a little bit to our tradition, weather, food and culture. For this purpose I had the great idea to talk about the tradition of christmas around the world and I' m going to start with my country. My writings would be with information on internet if someone don't agree with me let me know !

Simultaneosly I will practice my grammar and my writing so correct me any mistake. I will appreciate all your help.

Merry Christmas and happy Holidays .

Um, you lost me in that sentence about marketing people the american idea...But other than that, this writing is good practice! Good luck learning and merry Christmas to you too!

Do the advantages of watching trials on TV outweigh the disadvantages?

A week ago, I sat an IELTS test and wrote an essay about this topic. I would like to rewrite it and hope I can get some help from native English speakers.

It has become a commonplace that people from some countries can watch legal trials on TV these days. Even though there are a few negative repercussions of it, I still believe the benefits are far greater.

The most obvious benefit of watching the trial process to the general public is that they may acquire some basic knowledge about crime and learn what behaviour leads to breaking the law so that they are able to defend themselves if necessary. The law usually involves thousands of rules and stipulations (good word!), which makes it quite difficult to understand for the ordinary people. By airing the real cases happening in their daily life, citizens possibly get a clear insight (the underlined phrase IS ACCEPTABLE, but can be made slightly more smooth. Try: "it is possible for citizens to get a clear insight..." or "citizens can get a clear insight..." both feel a little bit more natural) into the misconduct and try to avoid committing the same crime in the future. Besides, the verdict being (you were missing a verb, so I added "be") in front of tons of TV viewers can really have (you either have to say that it CAN HAVE a deterrent effect, or that it HAS a deterrent effect. You were in between those two options) a deterrent effect on potential offenders because of the severe punishments on those criminals. There is no denying that sometimes people are not aware that their conducts may contribute to have a ("contribute to" again sounds a little unnatural, but isn't technically wrong. I also removed "a" from "a devastating consequences") devastating consequences to them. Therefore, it is necessary to inform the general public of the penalty they have to suffer if they have little knowledge about the sentence. (Try "if they are unaware about/of the sentence" to make it sound more smooth)
In addition, in the past, some relatives of plaintiffs claimed that the conviction was unfair and the defendants deserved a more severe punishment. They doubted whether the judge was bribed and gave an unjustified verdict. I personally think this possibility can be reduced significantly since the broadcast of this trial process was introduced because nobody dares to judge unfairly in front of millions of audiences.
On the other hand, the drawbacks of airing a trial process live also need some attention. Living in this civilized society, everyone has their own private right (try: "right to privacy) even if they are criminals. Those young defendants who have a high self-esteem may get hurt emotionally when they are on trial.
To sum up, despite a few disadvantages that have negative effect on the accused , I am convinced that these drawbacks are far overshadowed (good word!) by its benefits.

Hey! I hope my corrections were helpful, because honestly there wasn't much to fix. There were a few small verb-tense and spelling issues, but it's clear that you have a good grasp of the English language. I also tried to give feedback on making your sentences sound more like a native speaker because you're a good writer and I don't want you to be held back by the little details. Good luck and keep up the good work!

Some sentences

These days I learned some new words but I do not how to apply them to practice, so I wrote some sentences. If you find some time to read them and correct them, I will be very thankful.

Back off

Mike never backs off in the competitions. He always wins.

Good. "Back off" is usually used in competitive/argumentative contexts.

Back away

I was going down the street and suddenly a big angry dog jumped out of the bushes and run up to me. It growled and barked at me. I backed away but it came closer and attacked me. The dog bit me on the leg. I barely could dun away from that place.

Good sentences. Saying "it went closer" is perfectly acceptable, but "came closer" sounds more natural. 

Be back

I'll let you know when I am back.

Very common phrase--this would be a good one to memorize. In many places in America, I know, it's even common to use the informal "get back". Example: "I'll let you know when I get back."

Be off

I'm off the work today because I have done already what the boss asked me to do.
You can either say "I'm off work today because..." or "I'm off of work today because..." Either way, don't include "the"

Smash in

A rushing mighty wind smashed in the room and crashed a beautiful vase that was on a windowsill.

Um, I'm not sure that this is a very common phrase to use. What you have isn't technically wrong , but "smash" tends to be used more physically. To describe a fight, "Joe smashed his enemy into the wall," for example. The wind "smashing" a vase isn't very physical and therefore sounds awkward.

Swarm

A swarm of mosquitoes flew into a barn.
A swarm of people went out to protest against a law.
A swarm of people expressed their resentment with the new rulers of the country.
The horses galloped away, leaving after themselves a swarms of dust.

Try "a cloud of dust" or even "a trail of dust". Swarm, in my mind, applies to living things: mosquitoes or people. I hear the word most commonly associated with pests. For instance, "a swarm of flies," "a swarm of gnats," "a swarm of mosquitoes".

When shops announced 90% sale, people swarmed to buy everything they can.

This is correct but implies a slight negative connotation. In my opinion, the sentence is still VERY ACCEPTABLE to hear in an everyday conversation, but it does gently imply that the people were crazy or obnoxious in trying to buy everything they can. If you're looking for a more neutral word, try saying "people flocked to buy everything they can". 

A chain of supermarkets in Germany had to lay off workers to get over its bankruptcy.

Nasty

What a nasty smell? It's seems like a cat died here.

Thanks,

Your English is very good! Keep it up!!