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I’ve noticed some insert sets have been created with incorrect checklist numbers and realize that some are using the Cardboard Connection website as a source.

While a useful resource for details and reviews about new releases, the site receives information about most sets prior to their hitting the market. These checklists generally list cards (including inserts) in numerical order, whether those cards are ‘numbered’ as such or not. Please be aware of this before using the site to submit a list. There are several modern insert sets on the database which have been input incorrectly, thus giving collectors a tough time to properly locate spaces to upload images or do other research.

On a similar note, if you scan/upload a card with a SN and notice the checklist has a different number (most likely from an improper source), please adjust the edit notes accordingly.

Small details like these help make this site even better!

Best practice for checklist if you use CC, they typically have the excel spreadsheet at the bottom of the page from the card dealer. Another great practice is researching on eBay. Typically the best time to upload checklist is during the couple days after release date. eBay is your friend & this sites friend as well :).

Both of you make excellent points, and I'll add: ask for help! If you're adding a "major release" (pretty much any standard product from the big guns like Topps, Panini, etc.), it's very important to get it right the first time, otherwise a few people with access have to spend a ton of time fixing errors. It's great to see someone say "I'm trying to tackle the checklist for _____" and getting offers for assistance, especially because variations and SPs haven't always been IDed right away. Ask for help, take your time, and do it right the first time 

I will add do not be afraid to import your excell spreadsheet into google sheets and share the link. This will allow others to see what you have and they can send you what you have.

All solid advice here.

Additionally, there is a huge page of disclaimer material now when you try to upload a checklist for a Panini Insert set - for a reason. It's meant to be read. (This actually holds true for submitting ANYTHING to the site - please, please, please READ the dang warnings and requirements on those pages BEFORE adding anything to the site. This will save many people time and effort, and it will help you look smarter.) The Panini Insert disclaimer talks about how Panini is known for publishing checklists that do not match the cards. The checklists at CC and Beckett are usually direct from the card companies. In many cases, the only thing we can use to create the checklists here are looking at the cards themselves, either in-hand or some other online source (COMC, ebay, Goggle image search). We cannot even assume that the published checklists are correct - they are oftentimes not correct.

If you would like to see a good example of current panini practice then just look at the 2021 Prizm Draft Picks football autographs. That's a clear example of there card numbering is all over the place and it's nearly impossible to guess cards. I looked up every single card on eBay for that checklist for the correct card number and even then the redemptions I had to take educated guesses on. Overall, research is key. Topps & leaf are typically very good on checklist but even if it looks right it's best to check.

Heres some advice from first hand experience.    If its your first time entering a checklist, dont.   You're probably doing it wrong and you might not realize it.     Even if you dont think you have any questions to ask, I would post in the set forum or general forum that you want to do it, and can someone with experience please mentor you through it.