Diary: March 11th (pt. 2)

The convention here is that "pt." is an abbrevation for "part", so you wrote "part 2" and then abbreviated it to "pt. 2".

Yesterday was my first day to don my new part-time job.

Not sure if this is grammar or just style, but it reads better.

The job is to go to an elementary school every Thursday afternoon to teach children to play Go (a board game).

The old "an" before a vowel thing.

To be honest I was quite surprised because when I was in elementary school, these hobbiesy classes were not available at school and we had to choose hobbiesy classes ourselves.

I don't think there's a rule that dictates this, it just sounds better to me. There may be a proper term in English for classes like these, but if so I don't know it.

"choose" is strange here. You might mean something like "we had to find hobby classes ourselves"?

It was an unlucky afternoon.

A fun word to use here if you wanted to be poetic: "ill-fated" :)

I left the university campus with the intention of taking the bus to thate elementary school.

I see why you've used "that", but "the" sounds more natural here. You've only mentioned one elementary school, and we have no reason to believe you might mean any other.

When I arrived at the bus stop out of breath, the bus had just left!

I think you mean "the bus left a few moments before I arrived", right?

"when I arrived, the bus just left" - this means that, immediately after you arrived, the bus simply left. It did not let you board, it did not acknowledge you or apologise, it just left. Leaving was the only thing it did. A very rude bus.

Luckily there are many Uber-like apps and I booked a taxi in 1 minute and got oin the taxi within 5 minutes, onlybut it cost a lot of money compared to the bus.

We get "in" cars and vans, but we get "on" buses and trains. I think the pattern might be that if you can simply walk straight onto the vehicle, it's "on", and if you have to duck or clamber or step over something, it's "in".

"only" is almost a pure synonym for "but" here, and it's clear what you mean, but it doesn't feel quite right.

When the school computers shut down, they delete all the programs, so the program I downloaded in advance at that school iwas gone!

I think this is what you mean? It's not clear.

The internet was slow there, and a 1.5G GB installer took 30 minutes to download, which meant it took almost a class period to download.

Generally we abbreviate "gigabytes" like that.

Eventually the day finished. Finally I could go back home!

This exclamation feels like it needs more context. Without anything to move time forward a little, it's kind of like "finally I could go back" is a reaction to the battle of the infants and what a mess it was.

Then I busedtook a bus going in the wrong direction...

We generally don't use "bus" as a verb to mean "the subject travels by bus". We do sometimes use it indirectly - "the children were bussed to school". English is a strange language and I apologise.