When I woke up, I realized that today was a beautiful day because there was the sun. I took a bath, then I had my breakfast with milk and cereals. After that, I went to campus for the Italian Literature lesson. I ate in the canteen, and in the afternoon I did training in gym. In the evening, I was at home and I watched a movie in my laptop which made me relax.

diary

I've wake up now,today it's beautiful day,there is the sun.I had breakfast with milk and cereals,after I washed myself with soap and I 've gone at university for the Italian Literature's lesson.After I've gone to eat at canteen,in the afternoon I've done training in gym.In the evening I was at home to relax and to watch a movie with my laptop

When I woke up today, I noticed it was a beautiful, sunny day (I changed this sentence to the past tense). I had breakfast of cereal (cereal is already plural so it does not need an "s") with milk after I took a shower (or bath) (you don't need to include with soap because that is implied). I went to my Italian literature class at school (American version)/at university (British version) . In the afternoon, I ate at canteen (if this is the name of a restaurant, capitalize it to Canteen) and went to work out at the gym ("training" usually translates to "work out" unless it is personal training session that you pay for). In the evening, I relaxed at home by watching a movie on my laptop or I went home to relax and watched a movie on my laptop.

-"I've gone" should be changed to "I went to", this is the correct past tense :)

diary

I've wake up now,today it's beautiful day,there is the sun.I had breakfast with milk and cereals,after I washed myself with soap and I 've gone at university for the Italian Literature's lesson.After I've gone to eat at canteen,in the afternoon I've done training in gym.In the evening I was at home to relax and to watch a movie with my laptop

I woke up today and there is the sun. It's a beautiful day. After I showered, I had my breakfast of milk and cereal. I went to the university for the Italian Literature Lesson. Later, I went to eat in the canteen. In the afternoon, I trained at the gym. In the evening, I relaxed at home and watched a movie on my laptop.