If you have a high deductible medical insurance plan you can contribute to a health savings account (HSA).  Just do your research on line about all the rules for HSA accounts.  A lot of people use this as another investment similar to a Roth except better.  You can deduct your contributions to this plan (3500 for single and 7100 for married for year 2020).  If the plan is through you employer and they offer payroll deductions then you would be better to have the max amount deducted from you paycheck because in that scenario you would not pay any taxes on that money (no social security, medicare, or income tax), it is called a triple tax advantage if done that way.  If done outside payroll deduction you would only get the income tax advantage.

Once you have exhausted all avenues for tax advantage investing I would highly recommend looking into a company like Vanguard and check out their index funds, I actually have a Roth IRA and a traditional IRA and a taxed investment account with them.  I personally have their total stock market fund and their total bond market fund.  There are strategies for balancing those types of funds.  Two books I have read on investing are "The Little Book of Common Sense Investing by Jack Bogle" and "The Simple Path to Wealth by J.L. Collins".  Both of these books are very good.  I wish I had read them earlier in my career but better late than never.