Let’s /lets/ is the short form of ‘let us’, used especially to make suggestions:
Let’s go!

Use let’s to make a suggestion about something you and someone else could do together.

Let’s… is a fairly firm way to suggest something, and is usually used when you think the other person will agree:

• Let’s go somewhere different tonight!

• Let’s start by introducing ourselves!!

Do not forget the apostrophe:

• Let’s go (NOT Lets go)!!

To make a negative suggestion, do not say ‘let’s don’t’. Use let’s not:

• Let’s not tell anyone about this.

• Let’s not go out tonight.

Speakers of British English also sometimes say don’t let’s:

• Don’t let’s argue.

Okay! Let’s learn something new every day! 😉