If you DON'T know already, PLR stands for "Private Label Rights" product license standard. In the niche of Internet Marketing is where this particular idea took root as some prescient marketer-type saw that there was a need for content-based merchandise that could be used and re-used constantly, allowing the end-purchaser to not only use the product as it existed (while being able to slap their names and faces on it), but to also twist and rend the product into a completely-new form and function if so desired on the part of the end-purchaser.
This gives ENORMOUS leeway and flexibility to anyone with graphic design, copywriting, and content creation skills and green-lights them to make as much money off the product in as many ways as they can possibly imagine. Truly-talented entrepreneurs have taken this system and run with it to the tune of hundreds of millions of dollars in the last few years (even more now since the Covid-19 Pandemic kicked in). What those who take advantage of this cash-printing press-type system WILL ABSOLUTELY NEVER TELL YOU is HOW it's done. And unscrupulous elements in the mix have ascertained that they can make a mint selling the 'WHAT' of the process all day long without ever once revealing the mechanics and chemistry of just why this process is so profitable.
Resourceful entrepreneurs can sniff out all the base product they need with just a single (root) search query; "Index Of /PLR" - EXACTLY AS WRITTEN. This is the key to the doorway of unlimited resource location. In fact, do yourself a favor and plug the phrase into your favorite search engine and see what pops up (go ahead, take a few minutes...you're gonna need 'em, lol!). Did your eyeballs almost pop outta yer skull? I know. It's CRAZY the first time you realize you'll NEVER PAY FOR CONTENT EVER AGAIN...
Much of what you'll see when you first start down the rabbit-hole may not be your cuppa joe, which is why you'll have to refine your queries for your needs;
index of /PLR "Internet Marketing"
index of /PLR "Tutorials"
index of /PLR "Whatever U Need Search Phrases"
Don't be a lazy dumb-ass either, you'll need to search whatever result return you get ALL THE WAY TO THE LAST LISTING! You will miss some INCREDIBLE finds if you take that slack approach to search result combing. It's not just about the first two pages. Before you embark on your epic download quest, two ideas;
1) ORGANIZE, ORGANIZE, ORGANIZE!!!
What you don't want is to get drowned by your constant stream of acquisition of content, so get it together beforehand. Decide where to physically place your project as well as all the other considerations that go along with the planning of this enterprise just like any other profit project you were about to embark upon.
2) USE AND/OR SELL YOUR STASH!!!
Use the content for personal/client profit projects as well as sell them in their raw forms as compilations at forum marketplaces, microjob freelancing sites, classified ads, and even Social Media! As is fondly said throughout the rose-colored glasses world of Online Marketing, your profit levels are tied only to your imagination; dissect chapters and spin content to create original articles, rewrite content and combine with high-quality stock photos for even larger price-point items, it's trivial to the born entrepreneur to conceptualize endless streams of profit in this arena.
It cannot be emphasized enough that the road to grossly-exaggerated profits in this process of how to find and use PLR-licensed product in one step is that you still have to reach down inside and come up with original re-slanting of these products in order to rise above the target market playing field. In your reconstitution of these items, remember to pull in original aspects about whatever you're rewriting so as to create your OWN expertise-driven end-product.