在人教版八年级上册英语教材中，第一单元通常会围绕一个主题展开，比如介绍自己或他人。这一单元的重点在于学习如何描述人物的基本信息和特征。以下是一些重要的知识点总结：

1. 重点单词与短语

- 形容词：tall, short, thin, heavy, outgoing, serious, funny, smart, kind, friendly等。

- 动词：like, dislike, enjoy, practice等。

- 短语：be good at, be different from, the same as等。

2. 语法点

- 形容词比较级：用于比较两个人或事物的不同之处。规则变化如加-er（taller, shorter），不规则变化如good-better, bad-worse。

- 特殊疑问句：How do you like...? What's your favorite...? Who is...?

3. 句型练习

- 描述某人的外貌和性格特点：

- She is tall and outgoing.

- He is short and serious.

- 表达喜好：

- I like playing basketball because it makes me strong.

- My favorite subject is English because it's interesting.

4. 实际应用

通过对话练习来巩固所学知识，例如：

A: Who is your best friend?

B: Tom is my best friend. He is taller than me and more outgoing.

A: Do you like sports?

B: Yes, I enjoy playing football every weekend.

以上就是人教版八年级上册英语第一单元的主要知识点。同学们可以通过多听、多说、多读、多写来加深理解，并灵活运用到日常交流中去。希望每位同学都能在这个单元中学有所获！