You can invest/save any which way... nothing really matters until you accumulate "significant mass" in assets. How much is that? Well, a "few Hundred $K, or so".
Accumulating capital.. that's your first task. After that, investing intelligently. It's likely to be at least 10-20 years before you've got enough accumulated to "make a difference" in your life. IOW... save, accumulate, "dollar-cost-average", whatever... you have to build capital before anything you do will make a difference.
Start early. Invest regularly. The "early years" results don't matter much because the amount of capital is small.
(I began my investing career with $25/mo into a mutual fund. Today, I've got $Millions of my own to manage. I know of what I speak.)