I don't know what "tench-but" means but "ten-hut" is a military term for "Attention!" (as in, "let me have your attention!")

"Let's go out for dinner" is probably the better option. "I play baseball every day" is better. And I think what you're trying to say is "Mark the icon with a triangle" (triangular is an adjective describing a shape), or "Put a triangle on the icon" The other options don't really make sense...

In my opinion, "this morning" usually is talking about a past action: "I cleaned my room this morning." "This morning I went for a walk." Saying something in the future, like "I'll go to the store this morning" isn't generally a correct statement, but saying "I'll go tonight" or "I'll go this afternoon" would be correct. You could also say "I'll go to the store tomorrow morning". But really, since morning time is early in the day, you wouldn't typically use a future tense because there's not a lot of action before it (since it's pretty early in the day). Same with present tense, in general you wouldn't really use it with "this morning." Most people would probably just omit it, because if it's going on at that time, it's understood that it's happening in the morning time, and isn't needed at all. (Sorry if that was confusing:/)

Provocative is more of a word similar to 'annoying' or 'offensive' (it can also mean arousing someone by seduction), and Aggresive I think is a little more harsh, like 'hostile' or 'violent' and being very pushy to a higher extent than 'provocative' Put simply, aggressive is more harsh than provocative usually

What did italki give me?

As I've previously said (or previously mentioned), Italki allows me to meet a lot of awesome people, and I'm so glad  (or happy, thrilled, excited, etc.) that I'm making new friends in different countries like Spain, Turkey, France, China, Morroco, etc. (Leave out the 'and' in 'and etc.'). I want to travel around in the world someday, and I want to meet (or 'I hope that I meet') a lot of people from each (or 'every'. Either one works.) country that I want to go to. Some friends ('people' might be better than 'friends' in this case) that I met are not fluent but when we get on italki, we like to send each other audio messages. (You could also say 'we like to talk to each other'.) My biggest problem is being able to know what people are saying (when they're talking). It's still a little difficult (or 'hard') to understand what they're saying. (You don't really need that last sentence, because you're really just repeating what you already stated.) It really just depends on how fast they talk; it's usually easier to understand them when they talk slowly.  When I first started italki (leave out the 'to'), my friends and I would always voice chat (each other), and I managed to improve a little, but I still have a lot to learn. I try learning by watching movies and listening to songs. Actually, when I talked with some foreigners, it wasn't all that bad, probably because they spoke slower so I could understand them, but with movies I find it a (little) bit more difficult to know what's going on. I would like to learn how to speak (in) an American (accent) and a British accent (and others, too). And when my vacation begins (or 'starts'), I want to (or 'would like to') read Harry Potter in English. I've never read Harry Potter before, not even in Portuguese, so it will be a challenge to me. I hope I can learn more...

Overall, your English is very good, there's just a few things here and there that can be tweaked, but I'm impressed at your progress! By the way, in most conversations, 'I am', 'You are', 'He is', 'They will', etc. will be shortened with a contraction (and will be pronounced like): 'I'm', 'You're', 'He's', 'They'll', basically any time you have a pronoun and a conjugation of the verb 'to be' (am, is, are) or the auxiliary word 'will' (sorry if that was confusing :/. Here's an example: "I am going to the store" is usually "I'm going to the store" and "She has been studying calculus for three years" would be "She's been studying calculus for three years." Like I said, you almost always would use this contracted form when talking with someone, or when casually writing to or texting a friend, or other familiar person. However, in formal papers like essays, for example, most teachers/professors make you write it without contractions, as that way is more 'formal'.) If you ever have questions about grammar, or anything about English, just ask, and we'd be very willing to help! Good luck! (Have fun reading Harry Potter, I've never read  it!)