That's exactly what I do. Save gems for workers. It's simple common smart knowledge
Yeah I agree. 5 basic tips.
1. Don't rush your town hall.
2. Save your gems for builders I spent & 20 for gems to get a total of 4 builders and saved the rest of the gems for later (if you want to spend money)
3. Max out your gold/elixir extractors first. Then max out all defences and walls before moving on.
4. Everything has a building time so be strategic with your time.
5. Understand the difference between a trophy base and farming base once your shield timer runs out. Once your timer runs out move your town hall outside of your base not inside. Because you don't care about trophies and to start you want the longest shield possible. Most people want trophies. If an enemy destroys your town hall that's 12hr of shield for your extractors to collect more gold/elixir.
Hope some of this helps and happy clashing!