に

There are few usages in particle に。

1. It can be use as time marker

わたしは六時に起きます。　I wake up at 6 o'clock.
七月六日にイギリスに来ました。　I came to Japan on July 6th.

2a. When you receive something to someone. The persons from whom you receive those action are marked with に。

リーさんに本を貸しました。  I lent my books to Ms. Lee
鈴木さんに英語を教えます。　I teach Ms Suzuki English.

2b. When you give something to someone. The person whom you give/lend to are marked with に。

マリさんにCD を借りました。　I borrowed a CD from Ms. Mary。
岩崎さんに日本語を習います。　I learn Japanese from Ms. Iwasaki.

However, から　is used instead of に　when you receive something from an orgaization like a company.

木村さんは本田さんから花をもらいました。　Ms Kimura received flowers from Honda.
銀行からお金を借りました。　I borrowed money from the bank.

3. に　indicated the place where things/person are present.

わたしの居間にテレビがあります。　There is a TV in my living room