1. This is going to be good; Mrs. Hendricks loves teaching mechanics.
Colons and Semicolons
This is going to be good; Mrs. Hendricks loves teaching mechanics.

2. Colons-To Introduce Lists: Illustrations or Restatements: Quotations:
Use a colon to introduce a list, especially after a statement that uses such words as these, the following or as follows
When you use formal language
He requested the following: shoes, shirt, and pants.
Do NOT use a colon to introduce a list if the list immediately follows a verb or a preposition
The best nonanimal sources of protein are soybeans, wheat germ,…
Illustrations or Restatements:
Use a colon to introduce material that illustrates, explains, or restates the preceding material. A complete sentence following a colon is capitalized.
I often wish that my parents had had more than one child: They worry too much about me.
Quotations:
Use a colon to introduce a long or formal quotation. A formal quotation is often preceded words as this, these, the following, or as follows.
Mrs. Hendricks asked us to write an essay on the following African saying:

3. Colons-Other uses
Use a colon between the hour and the minute of the precise time, between the chapter and the verse in biblical references, and after the salutation of a business letter.
Examples:
12:45
Genesis 25:45
Dear Mrs. Hendricks:
Sir:

4. Semicolons-to separate main clauses
Use a semicolon to separate main or independent clauses that are not joined by a coordinating conjunction (For, And, Nor, But, Or, Yet, So)
GOOD: Max is a talented football player; he is also a fantastic singer.
BAD: Max is a talented football player; and he is also a fantastic singer.
What should I use instead?
2. Use a semicolon to separate main clauses joined by a conjunctive adverb (such as however, therefore, nevertheless, moreover, furthermore, and subsequently) OR by an expression such as for example OR that is
Abby has a complete grasp of the grammatical concepts; therefore, I imagine she is quite bored in this class.

5. Semicolons and commas
1.Use a semicolon to separate the items in a series when the items contain commas
Some of Mrs. Hendricks’s students are Stefani, the brain; Jesus, the talker; Josh, the quiet one; and Natalya, the doodler.
2. Use a semicolon to separate two main clauses joined by a coordinating conjunction ONLY when the clauses already contain several commas.
Becca, the runner, is known for her prowess in English, math, and history class; yet she struggles in art class, which is one many students find easy, and in gym.