As my online sales have increased, I started noticing how uneven cash flow can slow things down. Some weeks require higher spending on inventory and advertising, while revenue comes in later. It makes planning harder when expenses and income do not move together. I want to keep momentum without putting too much strain on operations. Right now I am trying to understand what financial tools are commonly used by online sellers. I am not looking for quick fixes, just a clearer picture of how others handle this stage. Any shared experience would be useful.