This code will add a FAQ section to your page. A working demo of what to expect is here.
These instructions apply to Shopify 2.0 themes like Dawn.

Firstly, create a new template file in your Templates folder. Call the file faq.json and add the following code:

{
  "sections": {
    "main": {
      "type": "main-page",
      "settings": {
      }
    },
    "faq": {
      "type": "faq",
      "settings": {
      }
    }
  },
  "order": [
    "main",
    "faq"
  ]
}

Create a new Frequently Asked Questions page for your site through your Shopify Admin Online Store -> Pages.
When creating the new page, make sure to choose the faq theme template, not just the Default page template.
Next, create a file called faq.liquid in the Sections folder. Add the following code to the file:

<div id="accordionGroup" style="margin: auto" class="Accordion page-width page-width--narrow spaced-section" data-allow-multiple>
     {% for block in section.blocks %}
  <h3>
    <button aria-expanded="false" class="Accordion-trigger Accordion-button" aria-controls="sect{{forloop.index}}" id="accordion1id">
      <span class="Accordion-title">
        {{block.settings.question}}
        <span class="Accordion-icon"></span>
      </span>
    </button>
  </h3>
  <div hidden id="sect{{forloop.index}}" role="region" aria-labelledby="accordion{{forloop.index}}id" class="Accordion-panel">
    <div>
      <fieldset >
        <p>
		{{block.settings.answer}}
        </p>
      </fieldset>
    </div>
  </div>
     {%endfor%}
</div>

{% schema %}
  {
    "name": "FAQ",
    "settings": [],
    "blocks": [{
        "type": "text",
        "name": "Question/Answer",
        "settings": [{
                "id": "question",
                "type": "text",
                "label": "Add the question text here"
            },
            {
                "id": "answer",
                "type": "richtext",
                "label": "Add the answer text here"
            }
        ]
    }],
  "presets": [
    {
      "name": "FAQ"
    }
  ]
}
{% endschema %}

<script>

"use strict";

Array.prototype.slice
  .call(document.querySelectorAll(".Accordion"))
  .forEach(function (accordion) {
    var allowMultiple = accordion.hasAttribute("data-allow-multiple");
    var allowToggle = allowMultiple
      ? allowMultiple
      : accordion.hasAttribute("data-allow-toggle");

    // Create the array of toggle elements for the accordion group
    var triggers = Array.prototype.slice.call(
      accordion.querySelectorAll(".Accordion-trigger")
    );
    var panels = Array.prototype.slice.call(
      accordion.querySelectorAll(".Accordion-panel")
    );

    accordion.addEventListener("click", function (event) {
      var target = event.target;

      if (target.classList.contains("Accordion-trigger")) {
        var isExpanded = target.getAttribute("aria-expanded") == "true";
        var active = accordion.querySelector('[aria-expanded="true"]');

        if (!allowMultiple && active && active !== target) {
          active.setAttribute("aria-expanded", "false");
          document
            .getElementById(active.getAttribute("aria-controls"))
            .setAttribute("hidden", "");

          if (!allowToggle) {
            active.removeAttribute("aria-disabled");
          }
        }

        if (!isExpanded) {
          target.setAttribute("aria-expanded", "true");
          document
            .getElementById(target.getAttribute("aria-controls"))
            .removeAttribute("hidden");

          if (!allowToggle) {
            target.setAttribute("aria-disabled", "true");
          }
        } else if (allowToggle && isExpanded) {
          target.setAttribute("aria-expanded", "false");
          document.getElementById(target.getAttribute("aria-controls")).setAttribute("hidden", "");
        }

        event.preventDefault();
      }
    });

    accordion.addEventListener("keydown", function (event) {
      var target = event.target;
      var key = event.which.toString();

      var isExpanded = target.getAttribute("aria-expanded") == "true";
      var allowToggle = allowMultiple
        ? allowMultiple
        : accordion.hasAttribute("data-allow-toggle");

      var ctrlModifier = event.ctrlKey && key.match(/33|34/);


      if (target.classList.contains("Accordion-trigger")) {
        if (key.match(/38|40/) || ctrlModifier) {
          var index = triggers.indexOf(target);
          var direction = key.match(/34|40/) ? 1 : -1;
          var length = triggers.length;
          var newIndex = (index + length + direction) % length;

          triggers[newIndex].focus();

          event.preventDefault();
        } else if (key.match(/35|36/)) {
          // 35 = End, 36 = Home keyboard operations
          switch (key) {
            // Go to first accordion
            case "36":
              triggers[0].focus();
              break;
            // Go to last accordion
            case "35":
              triggers[triggers.length - 1].focus();
              break;
          }
          event.preventDefault();
        }
      }
    });

    accordion
      .querySelectorAll(".Accordion-trigger")
      .forEach(function (trigger) {
        trigger.addEventListener("focus", function (event) {
          accordion.classList.add("focus");
        });

        trigger.addEventListener("blur", function (event) {
          accordion.classList.remove("focus");
        });
      });

    if (!allowToggle) {
      var expanded = accordion.querySelector('[aria-expanded="true"]');
      if (expanded) {
        expanded.setAttribute("aria-disabled", "true");
      }
    }
  });
</script>

<style>

.Accordion {
  padding: 0;
  margin: 0;
  border: 2px solid hsl(0, 0%, 82%);
  font-size: 1.5rem;
}

.Accordion h3 {
  margin: 0;
  padding: 0;
}

.Accordion.focus {
  border-color: hsl(216, 94%, 73%);
}

.Accordion.focus h3 {
  background-color: hsl(0, 0%, 97%);
}

.Accordion > * + * {
  border-top: 1px solid hsl(0, 0%, 82%);
}

.Accordion-trigger {
  background: none;
  color: hsl(0, 0%, 13%);
  display: block;
  font-size: 1.5rem;
  font-weight: normal;
  margin: 0;
  padding: 1em 1.5em;
  position: relative;
  text-align: left;
  width: 100%;
  outline: none;
}

.Accordion-trigger:focus,
.Accordion-trigger:hover {
  background: hsl(216, 94%, 94%);
}

.Accordion *:first-child .Accordion-trigger {
  border-radius: 5px 5px 0 0;
}

.Accordion-button {
  border-style: none;
}

.Accordion button::-moz-focus-inner {
  border: 0;
}

.Accordion-title {
  display: block;
  pointer-events: none;
  border: transparent 2px solid;
  border-radius: 5px;
  padding: 0.25em;
  outline: none;
}

.Accordion-trigger:focus .Accordion-title {
  border-color: hsl(216, 94%, 73%);
}

.Accordion-icon {
  border: solid hsl(0, 0%, 62%);
  border-width: 0 2px 2px 0;
  height: 0.5rem;
  pointer-events: none;
  position: absolute;
  right: 2em;
  top: 50%;
  transform: translateY(-60%) rotate(45deg);
  width: 0.5rem;
}

.Accordion-trigger:focus .Accordion-icon,
.Accordion-trigger:hover .Accordion-icon {
  border-color: hsl(216, 94%, 73%);
}

.Accordion-trigger[aria-expanded="true"] .Accordion-icon {
  transform: translateY(-50%) rotate(-135deg);
}

.Accordion-panel {
  margin: 0;
  padding: 1em 1.5em;
}

/* For Edge bug https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/4806035/ */
.Accordion-panel[hidden] {
  display: none;
}

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}
</style>

Now, within in your theme customizer, navigate to your new FAQ page (you may need to add it to your site’s menu through Online Store -> Navigation) and the new FAQ section should be available to add to your page.
If you do not see it at first, just click Add section and look for FAQ in the list of available sections.

You can now add question/answer pairs to the FAQ section.