Most areas allow copper TUBING for propane gas. No solder or compression fittings allowed. All joints must be flare type. Using tubing either eliminates or reduces the number of joints due to the selection of lengths available. My way of thinking is that every joint is a place for a possible leak. Use air to pressurize the line after installation and a leak detector such as soapy water to indicate leaks. Be aware that valves can be a source of leaks so be sure to plug off each end of the line and test for leaks on the valve also.
If you have never made a mistake, you haven't done much.