The tax forms are different for 2018 and beyond since the new tax laws went into effect. Everyone gets a "postcard size" Form 1040 that only goes to line 23. In addition, there are six possible extra pages called "schedules" that may be included as part of the tax return that you prepare and file.
https://www.irs.gov/pub/irs-pdf/f1040.pdf
https://www.irs.gov/pub/irs-pdf/f1040s1.pdf
https://www.irs.gov/pub/irs-pdf/f1040s2.pdf
https://www.irs.gov/pub/irs-pdf/f1040s3.pdf
https://www.irs.gov/pub/irs-pdf/f1040s4.pdf
https://www.irs.gov/pub/irs-pdf/f1040s5.pdf
https://www.irs.gov/pub/irs-pdf/f1040s6.pdf
If your tax return requires the use of any of the "schedules" you cannot use the Free Edition. You have to upgrade to a higher paid version of the software, unless you qualify to use a DIFFERENT free version of the software:
Try Free File:
You qualify if your income was $34,000 or less, or $66,000 or less if active duty military, or if you qualify for Earned Income Credit
https://ttlc.intuit.com/questions/1900583-what-is-turbotax-free-file-program
In order to use Free File you have to use a different account and user ID.