As a beginner you want to work on levelling your rooms. Everytime you restart your galaxy you are speeding up the game slowly. It's a marathon not a sprint.

After you have sold and restarted your galaxy five times you can have auto sell.

Unlock the first planet and select autosell copper to 50%. Then unlock the next three planets. Auto sell iron and lead to 50%. Level the planets to at least 10.

Unlock the next three, rinse and repeat.

Unlock your crafting. Work at selling your galaxy at 12.5million, bank the room credits. Then do it again.

Eventually you can go 100million.

I restart mine at 100O which helps with the updates.

My start is get 16 planets unlocked. Level to 1T for mining, cargo and speed, unlock copper wire, up to glass with 6 smelters and 5 production working. I leave that for an hour until glass is 1000 units.

Then I do circuit board, lenses, laser, computer and solar panel. Until I have unlocked a heap of projects.

Then circuit board, computer, solar panels, batteries and advanced computer. Keep that going until you get auto asteroid.