Of course you obviously want to have some personal savings, as well as health insurance, long term care insurance, burial insurance, and probably at least a small term life policy.
Having some sort of financial advisor/planner is a good idea once your liquid assets get into the 6 figure range.
Assuming these are already taken care of, an IRA/Roth is generally a good idea for most people, as is a 401k or similar work plan if a decent one is available. And just as a Roth IRA grows tax-free with after-tax dollars, a Roth 401k also grows tax free with after tax dollars, and doesn't have the income limits that the Roth IRA does. And just as the traditional IRA contribution is tax-deductible, the traditional 401k contribution is considered pre-tax and will lower one's taxable income level. And 401k contribution limits are currently over 3 times higher than IRA limits.
If you have accumulated a fair amount of money (or plan to), it is often a good idea to consider putting assets inside of corporate structures and/or trusts - out of reach of such creditors, shielded from lawsuits, etc.
Most wealthy people have very little in their own names. And if they built their own wealth, they got wealthy by investing - either in their own private companies, or in publicly traded stocks, mutual funds, etc. Beyond having enough cash to pay the bills and live comfortably on, hoarding all or most of your cash away in deposit accounts or under the mattress isn't the best idea.
It is generally a good idea to take advantage of such tax-advantaged retirement plans. You cannot have any sort of decent lifestyle living off social security, and I doubt it will be available beyond a few more years anyway.
Putting $100 a week into an IRA and $300 a week into a 401k (hopefully some of that via an employer match) for several decades will likely add up to several million dollars over that time - IF one assumes the same rate of return we've seen in the S&P index over the last half century or so.