I am new to renting - say I have 300 points to rent unless it is perfect match I will usually only be able to rent a percent of them - say 280 - so how do I rent all of them - or do I just bank the lefovers
Yes, any points you are unable to rent can be banked (based on their status and your banking window). Some members will even offer to borrow a few points from the next Use Year to round out a reservation - so you might need to rent 305 points total to get rid of the 300 you have.
You can also consider making a transfer to another member as long as the points are all current points that have never been banked.
I have rented points occassionally and have found it necessary to either borrow a few extra points to make a reservation or find two different renters to use the points that were needed to rent.