Hello Greg, welcome!

Most stamps you buy nowadays from the Post Office, unless printed in small quantities and not in the millions or hundreds of thousands, will no appreciate in value .
The catalogues may say they do but try to sell them to a dealer or even another collector.
If, down the road, someone decides they want to sell your stamps, they will get less than face value, probably a lot less, because dealers have to resell the stamps and have to make a profit.
To invest in stamps I believe you need to know your stuff, just like any form of investment, choose wisely and then cross your fingers and hope you did the right thing.
The main value in most stamps is in their enjoyment value, sharing and art, history, and just being a collectible, giving those who like to collect and sort something to do. Also sharing or enjoying who they came from and remembering the enjoyment that person had from them. That sounds terrible as I do love stamps and all myself.
It really depends on the salesmanship skills and money saving skills of the recipients of your stamps. If they can get on
ebay or whatever it is at that time, and sell the heck out of them, then they are a good idea. But if they don't want to take the time nor have the skills needed, then it's not going to amount to much more than 10% of what you paid.
There are always exceptions but that is the reality of most stamps.
If someone told you different they were probably trying to sell you some stamps.
Most will tell you the above. However, there are sellers on SCF here and you wonder how they do it. They know there stuff. They go and buy something, knowing all about it beforehand, for a low price because it is mis-described, and then sell it for the going price, knowing what will make a difference and how to draw attention to those features. Or at least have some skills in that area.
You can still luck out and strike the jackpot but that is rare.
But again, if a stamp looks good to you now it will probably look good to someone years later. Good taste remains good taste and not every stamp is a winner.