Tier 1/2 is definitely not easiest. Even though you would make good business with that one since there’s always high demands for it, there’s people (like me sometimes) that likes their Tier 1 tools on max speed or near max durability or even both! That on topaz tools which are harder to forge requires definitely some good skills, luck and lots of ingredients
(Even you can always work with persisting pie, speed brews etc.) And you can forge them very easily with like basically just aoe, but people like to also save on them pies or brews and “get the most out of the tool”.
[While in my opinion it’s still better to do brew and instead buying two tools which would have together more durability then one tool with max durability -easier for the forger and cheaper for yourself since maxed tools are extremely expensive! But as a mother that might need to pause her game a lot and got frequent interruptions, I appreciate the maxed tools these days since I would waste hundreds of pies and brews otherwise :D]
So I can’t recommend that category for you.
Easier categories are farming tools, liquid tamer, effect bombs, heal bombs, damage bombs.
Here to know is, everything can be easy or fancy.
Farming tools are basically aoe tools. You don’t want damage on there, speed is not necessarily the best option and dura is optional. Optional is magnet and glow. You could offer different types there because customers have different wishes. You could offer them from wooden tool and extra cheap to fancy and expensive. For gem tools the damage defect could be considered - I don’t have knowledge about that how complicated that could be to apply. But that’s not what i would set as expectation. More if you want to play around.
Liquid breaker and solidifier would be aoe or single shot and then fancied-up with additional speed or durability.
You can do different quality forging. Don’t focus on just one. Do a bit of higher “quality” do a bit of simpler tools and something in between. That way you satisfy a wide range of customers.
Solidifier are just totem products and Totems can be hard to forge. Also you need more advanced ingredients. Maybe should consider splitting this category? -fast forward yes! I will do some adaptions on the market when it comes to totems. Liquid breaker and solidifier will be two different categories.
Effekt bombs would be shield, speed and strength boon. Can come with extra glow and bigger boom boon for larger effect range.
Heal Bombs are a little extra again. There you can go also for different qualities. But in general counts, the higher the damage boon the higher the heal effect. Therefore also diamond bombs heal the most. Level 3 on healing and then optional also range. For heal bombs I would like that you offer some in simple metal, some in precious metal and some in gem because of the stacking of bombs.
Damage bombs can come with range as well. And otherwise? Whatever the heart desires. Never used them really. Maybe knockback or glow if it shall be fancy?
So I recommend, farm tools and liquid breaker as possible easiest categories.