New words/phrasal verbs

Today I've learned a few words so I would like to come up with some sentences and know weather they are correct or not.

1) (leave out) : we need to clean the fridge, let's leave out every thing that is past dated.

This one should probably say "take out" instead of "leave out." Here's an example with leave out:

When you through away some food after cleaning the fridge, make sure you leave out the stuff that's not expired yet.

2) (rub off): I got some tomato sauce on my white jeans, I tried to rub it off but it was difficult.

Great!

3) (walk through): Please walk me through the charts.

Great!

4) (daunting): walking alone on the street late at night can be quite daunting.
This one is technically correct, and it conveys the meaning perfectly fine, but it would come off as slightly awkward. "Daunting" usually refers to tasks that are difficult. While walking at night might be scary, it is not usually incredibly difficult.

Thanks!

You're welcome!

New words/phrasal verbs

Today I've learned a few words so I would like to come up with some sentences and know whether they are correct or not.

1) (leave out) : we need to clean the fridge, let's leave out every thing that is past dated.
2) (rub off): I got some tomato sauce on my white jeans, I tried to rub it off but it was difficult.
3) (walk through): Please walk me through the charts.
4) (daunting): walking alone on the street late at night can be quite daunting.

Thanks!

Leave out doesn't quite make sense. Your sentence almost makes it sound like you're not going to clean the past-dated (expired) items. 

It means to exclude or to leave something out in a physical way (especially when it's traditional placement would be inside of something. 

Examples:

"He left me out when he decided to buy a cat." (ie: He didn't include me in the decision)

"When we cleaned the fridge we accidentally left the pie out." (ie: We forgot to put the pie back)

"I left my car out on the street." (ie: I parked my car on the street)

Rub off is correct but it has another meaning- to transfer by contact or influence.
Example:
"I'm talking to Paul so much that his Irish accent is rubbing off on me." (ie: I'm beginning to speak with an Irish accent because I'm exposed to his)

Walk through is correct but sounds a little forced in this case. It's used more in a situation that has steps or parts.

Example:

"Please walk me through the procedure." (ie: Explain what happens at each stage of the procedure)

"I'll walk you through online registration." (ie: I'll help you step-by-step through the process)

Daunting is again correct but is more appropriate in overwhelming or intimidating situations (not so much 'scary' situations). Walking home alone at night is frightening but it's not something that will be a "challenging" task for you. 

Let me know if that helped!