Era 1

"I Don't Want It at All" was the first single, released on 1 August 2017; a music video co-starring Paris Hilton was released on 30 October 2017.^[4] The second and third singles, "Hills" and "Hillside Boys", were released on 22 September 2017. The fourth single, "Slow It Down", was released on 10 November 2017. The fifth single, "Faded", was released on 15 December 2017, and a music video was released on 25 January 2018.^[5] The sixth single, "Heart to Break" was released on 14 February 2018, and a music video was released on 26 April 2018.^[6] The seventh single, "Can't Do Better", was released on 8 June 2018. The eighth single, "All the Time", was released on 24 August 2018. The ninth to eleventh singles, "1, 2, 3 Dayz Up", "Homework" and "If U Think About Me...", were released on 7 February 2019, marking the final releases from the project.^[7]

Petras described the project as a "full rainbow", in reference to all the single covers utilizing a gradient of colors, and wished to complete "Era 1" before releasing her debut mixtape, Clarity.^[8] To coincide with the release of Clarity, Petras embarked on the Broken Tour in 2019, which also included the majority of "Era 1" on its setlist.

In 2022, following the inclusion of "Can't Do Better" in season 1 of the TV series The Summer I Turned Pretty,^[9] Universal Music Group released the compilation onto streaming platforms on 4 August 2022, containing all eleven singles in release order, though this compilation was delisted shortly afterwards.^[1]

The standalone singles themselves received generally positive reviews from critics upon their original release, who mainly praised the overall dance-pop sound, as well as their catchiness.^[10][11] The collection of singles is noted to have contributed to Petras' commercial breakthrough, as a few of the tracks entered various Billboard charts upon their release.^[12]