Questions about example sentences with, and the definition and usage of "Taro"

A: They mean the same thing but one is grammatically correct and the other isn't. "Who" sounds more natural. You shouldn't say "that" because it doesn't refer to a person, it refers to an object.

"This is Taro who likes to play baseball"
" That was awesome!"

A: The first sentence is more natural, and suggests that Taro provided some detail about the trip.
In the second sentence, „told“ without a preposition doesn‘t sound natural to my ear.

A: I don't think there is a difference. Both are correct and natural.
The word "still" simply puts more emphasis on the fact that you have known Taro for a long time and he has changed but you still know him. (I hope that makes sense!)

A: Taro is a friend of mine. He and I have a few common interests. We also have a similar way of thinking, and share the same financial sense. He is my best friend!

A: He has four sons. They are named Taro, Jiro, Saburo, and Shiro.

A: The boy who is wearing glasses is Taro.

A: This is Mr Hanako, introduced by Mr Taro, と思います..

A: × So he was able to remember a sheet music quickly.
✓ He was able to memorize sheet music quickly.

× One day, his parents traveled abroad and he had to make dinner by himself.
✓ One day, his parents traveled abroad and he had to make dinner for himself.

× After the day, he made efforts to become a cook.
✓ After that day, he tried to become a cook.

× 30 years later, he became a cook.
✓ Thirty years later, he succeeded!

A: × Taro and Jiro met through their mutual acquaintance in Japan.
✓ Taro and Jiro met through a mutual acquaintance in Japan.

× Then after a while, they made songs together and the band slowly formed.
✓ Then after a while, they started creating songs together and their band slowly came together.

× They have just started with a reputation as one of Japanese up-and-coming band.
✓ They have a growing reputation as one of Japan's up-and-coming bands.

× They have roots in 60's/90's rock like The Doors, Radiohead, on the other hand, they merge electronic sounds of the modern era with their old roots music.
✓ They have their roots in rock from the 60s and the 90s, inspired by acts like The Doors and Radiohead. But they also mix modern electronic sounds with music that has older roots.

Your version was pretty good!

A: × Taro let me to make a poster that put on entrance wall.
✓ Taro let me make a poster to put on the front wall.

A: × Taro didn't like going to preschool at first, but he got fit in now.
✓ Taro didn't like going to preschool at first, but he got used to it.

You can also say... he fits in now. if he didn't have friends before but he does now.

A: Could you please invite them to play 'date'? (That's polite enough. But you can add if you really need) Would that be possible?