You bred a ton of cubs and don't know what to do. Lemme help.

Heritage
A cub's heritage is an important part of its value in the trade Center. People like short heritages because it's easier to track and keep an eye on. A lot of people care about this.

Example of a short heritage. Each vertical row of names is a generation. Here there are 3 vertical rows with names, that makes this lion a G3. G-gen/generation.



In the case of dirty lions, this will cause it's value to drop in most cases unless the buyer doesn't care about heritage. This isn't much of a reason to overprice tho so be careful.

This lion has inbreeding in it's heritage. That's called dirty. Its considered undesirable because it's immoral for relatives to have kids together. Some don't care. It's ok, but upset others sometimes.


Traits

The traits of a lion are important, more so then the heritage.

Let's use of my lions on side account as an example.
This lion is prime example of a reasonably valuable lion.
It's appearance is nice. The markings fit together on the lion and there is very few t1 and t0 markings.
The mutation is a patches Vernal, it matches the appearance and compliments the lion. Vernals are worth about 3gb on average. Any lower and it's dirty, or a tater.(bland lion with few to no marks.)
It had some breed only traits and that nice! It adds a bit of value! As does the low gen! This lion averages about 4-5 gold beetles due to both the mut, and the appearance traits.


Taters
Potatoes are cubs and lions that hav little to no markings, they have very little value and don't add appeal to your pack or beetles to your stache. Trade Center doesn't want these, especially if they're dirty. If you do, fodder them for no more then 25-30 silver beetles. That way you might still make something off it if it matche someone's enclave quest. Win-win.

If the tater has a mut, it does not make the valuable. If your lucky you'll get a gold beetle, but it's ok to kill these, or you give them away to a newer account that doesn't have a mut or has very few muts.

Nuggets
Nuggets. Pretty lions, valuable lions, lions with lots of markings.

These guys CAN be valuable. But they can still be trash. Just cus it has lots of markings or has alot of color or something doesn't mean it's going to be valuable. The markings and mutation can bring the lions worth up to a good amount of gb, but if it's not pretty or the markings clash? No one will want to buy it so the value drops a little.

If your lioness births a cub with a handful of markings, they fit together but it looks incomplete, you can fodder that. It's not truely valuable but someone might like it. Sell it for cheap sb, maybe 25-45sb and if it gets sold before adol, Great. If not? Kill it or tree it.

Marking types
Theres a variety of marking types
This tidbit from the wiki explains them:
Tier 0 - Common Markings: Also known as "NCL Markings" or "Wild Markings", these markings are found on game-generated Newly Claimed Lionesses and rolled pride leaders. They can be obtained via the Marking Applicator in the Oasis, the Oasis Customiser tools, Random Marking Applicators, and Total Shuffles.
Tier 1 - Custom Markings: These markings can be applied via the Marking Applicator in the Oasis, the Oasis Customiser tools, Random Marking Applicators, and Total Shuffles.
Tier 2 - Raffle Markings: Also known as "Breed-Only Markings" or "Special Markings", these markings originate from raffle lionesses released each week. They cannot be selectively applied and must only be bred down from parents with the markings or randomly obtained with luck from Random Marking Applicators and Total Shuffles.
Tier 3 - Event Markings: These markings includes April, February, and September event-exclusive NCL markings, July and August event exclusive markings, exclusive NCL markings (Cinnabar, Clay, Copal, and Marigold), and event applicator markings—basically anything that originates from an event can be found in this tier! Some of these markings cannot be selectively applied, while others can. They can be randomly obtained with luck from Random Marking Applicators and Total Shuffles.
Tier 4 - Rosette Markings: These markings can show up seemingly at random during breedings! They cannot be selectively applied, but can be passed down from parents with these markings, or spontaneously occur during breedings. They can be randomly obtained with luck from Random Marking Applicators and Total Shuffles.
Tier 5 - Hybrid/Restricted Markings: These markings can only be obtained via first generation hybrids (and their offspring) or Gorilla Enclave/Referral Shop marking applicators. They are blocked from being obtained via Random Marking Applicators and Total Shuffles.
Tier 6 - RMA-Exclusive Markings: These markings can only be obtained via Random Marking Applicators and Total Shuffles, or passed down from a parent with these markings.

The markings you should consider most valuable are t2, t4, and t6.

T6 is valuable because RMA exc. Marks are hard to RMA. So they, as well as rosettesc can be considered breed only due to the fact that you can get them through breeding, or using a pile of rmas/mark removers.

T3 is valuable, or would be if they weren't so common and easy to find. So most overlook them and I understand that. But let's not dismiss them entirely. They are still important in spite of how common they have become.

T0 and t1 are not truely valuable. Unless you yourself like them, but..

Simply iking it does not increase how valuable it is in trade center (this applies to all lions and lion traits).

(I will add more as needed)