An important factor when it comes to characters is to always introduce your characters well, because if you don't, you run the risk of ruining your chapter, especially if you mess up the introduction of your main character.

One thing you should never do is make several paragraphs explaining how your character looks, how they act, their backstory, etc, or else you run the risk of typing up 1k words of needless info or too much information.

One thing novice writers tend to do, and something I used to do, is explain away everything in a single sitting, and that's a poor choice to make since the reader doesn't have the patience of a rock wanting the wind to turn it into sand.

This is apparent in fanfics, the more recent example of this is a fanfic called Equestrians Human Spirit, which was a prologue chapter explaining how the character looks, what his life was like, his past including dead parents, etc, leaving no impact for emotional scenes of him revealing his past to his new friends, and his past doesn't affect how he acts in the story either. For example, he is said to have had no friends, which makes him likely antisocial or something, and being bullied, yet somehow, he is able to make quick friends with the characters later on.

An example I can give is this brief introduction here

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It was a bright day, with only a few clouds in the sky, beaming down on a small village of around 900 people or more. Many were at their homes, children playing around, adults going to work, and some wagons going in and out of the village, be it for food or transport.

A mother was watching her son load his things up into a carriage, looking quite sad. "Mike, please remember to stay safe over in the kingdom, and make sure to write home often." She said, trying to hold back some tears.

The boy, Mike, looks back at her, smiling gently before turning to her. "Mom, I'm gonna be fine, I've been training swordplay for years now, nothing is gonna take me down." Mike confidently said, grinning widely. "And don't worry, I'll make sure to write every... Week or so."

"I'm sure you will." She laughs in response, smiling a bit. "...Look at you, old enough to join the guard, passionate to be part of the kingdom's knights... Your father would be so proud, you following in his steps."

"Yep, I'm sure he would... I'm gonna miss you mom." Mike responded, walking towards her and putting his arms around her, and in turn, she hugs him, crying a bit. "...Aw mom, come on, don't cry, I'll try and visit you as much as I can." He reassured her.

"I know, but I... I'll just miss you." His mother gently rubs his raven colored hair. "My baby boy is leaving me, how hard do you think this is for me?"

"I know mom, I know..." He kept the hug going before the two heard a bell from the wagon's driver. "Well... I best be going now." He said, breaking the hug and running to the wagon.

She wiped her tears with a tissue, waving her hand at him. "See you Mike, and make us proud!"

"I will!" Mike shouted back, hopping into the wagon, looking back at her from the back, waving as well before it began moving.

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I know this was maybe not that good to read, but hopefully this gets my point across. Establishing a character through dialogue and setting, from thiss,I assume you caught some details about him, his name being Mike, having black hair, having trained with a sword for years, loves his mom, father either gone or dead, going to som kingdom to become some kind of knight, etc.

Though, I kept the details vague enough for it to make you wonder several things, Knights of what kingdom,what happened to his dad, who was he, etc. Because these questions get answered through the story, and through Mike going to a kingdom, this gives the next paragraphs/chapter a chance to make a new setting, making the world grander, etc.

This is likely confusing but I do hope I get the point across.

Part 3 will be about world building and how to implement that into the story

Thank you for reading this