At low level you should pay attention to your main spells and troops with those pearls. Remember that you can increase spells and troops by 30-40% by forging them as soon as they are out of cool down and can be forged again. What’s this learning what the hang to know to forge? You should not forge everything just because it’s forgeable. That’s just not smart.
What spells do you use mainly, first focus on those. Same question for troops. Which you use in offense plus defense? Those get highest priority, then the ones you use in offense and last but not least the ones in defense. And don’t forge only one spell or troop simultaneously, that’s pointless.
At low levels, you should focus on improving your main spells and troops. You just can’t start early enough with doing that.
You really need to improve as many as you can of those simultaneously and ignore the ones you never use first, those you can forge later. Remember that from the moment something is forged (or improved), from that moment on you benefit.
As soon as you have a maxed blacksmith and get enough pearls from either pro league, ninja season or luck gear, only when you have enough pearls to spare, only then you should focus on towers and items only and items only when they are level 130 or are skull perks.
Every time you don’t forge, you fall behind a bit. When you wonder why you lose raids and people easily beat your base, there you have your answer. Those micromanagements by forging once, don’t make any difference, but 15+ forges on every stat will definitely make a difference. And when you realize it later, nice that you have 130k+ pearls, it needs plenty of time (a year or more) to improve those stats by forging, you can only forge one stat at a time and then need to wait for the cool down period.
Now let me give the example for ogre. I didn’t forge them for a long time, since our team didn’t boost them and I used ranged troops instead. Then we suddenly started to boost them, but I simply could not keep them alive, by the fact that my ogre was too slow and constant staying behind. Then I suddenly started to improve ogres, first speed, then health and finally attack rate. And suddenly I was able to keep them alive and did win raids against bases, that were out of my league without them.
Pearls are similar like gold, when you can improve (or upgrade) something, use them to do it. It’s an investment and from that moment on you benefit. You can keep them and save them for a good moment, but you fall behind, when you keep them (for what reason?) for a long period of time without forging. Pearls you must see as an investment to improve your stats. They improve the odds that raiders fail (and give you gems) and increase the odds that you win (and get more cof, gold and even pearls). Investing them is a win-win situation. not investing them is asking for problems and when they appear, you have to invest them, but still cool down period will then not be your greatest friend. Like I said, it takes a lot of time to improve stats by forging.
For items with skull perks it’s also handy to forge them. It looks like throwing pearls away, but in fact it isn’t. Every 0.1% extra gives you an extra skull per raid. Now this doesn’t look much, but you can get an extra 300-350 skulls per raid if you keep forging those. This can be the difference between winning a war (when more players in your team invest in those) or losing, it also makes the difference between reaching higher war chests. Imagine that there’s an improvement possible from 30-40% by just forging stuff. And I rather have improved stuff than a mountain of pearls in reserve.
But hey, if you save them, that’s your choice.