Here is a clear step-by-step tutorial to make the Christmas swirl coaster you showed (white center + red/green twisted border).
You only need basic crochet stitches.

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🎄 CHRISTMAS SWIRL COASTER — SUPER DETAILED TUTORIAL

⭐ Stitches you need

• ch – chain
• sl st – slip stitch
• dc – double crochet
• FPdc – front-post double crochet

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🧵 PART 1 — MAKE THE WHITE CENTER

Round 1

1. Make a magic ring.
2. Chain 2 (counts as first dc).
3. Work 12 dc into the ring.
4. Pull ring tight.
5. Slip stitch into top of chain-2 to close round.
   ✔ You should now have 12 stitches.

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Round 2

1. Chain 2.
2. In every stitch around: make 2 dc in each.
   ✔ You now have 24 stitches.
3. Sl st to join.

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Round 3

1. Chain 2.
2. Repeat this pattern:
   • 1 dc in the next stitch
   • 2 dc in the next stitch
3. Continue around.
   ✔ You now have 36 stitches.
4. Sl st to join.

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Round 4

1. Chain 2.
2. Repeat pattern:
   • 1 dc in next 2 stitches
   • 2 dc in next stitch
3. Continue around.
   ✔ You now have 48 stitches.
4. Sl st to join.

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✨ The White Circle Is Done

Now comes the swirl border, the part that creates the red-green twist.

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🧶 PART 2 — MAKE THE RED + GREEN TWISTED BORDER

This part uses Front Post Double Crochet (FPdc).

FPdc goes around the post of the stitch, not in the top loops.

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🔴 RED ROUND (first layer of twist)

1. Attach red yarn to any stitch.
2. Chain 2.
3. In every stitch around, make:
   ✔ 1 FPdc around the post of the white dc below.
4. Do NOT join with slip stitch.
   • Just pull the red yarn to the back and let it hang.

👉 This creates a full round of red FPdc stitches.

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🟢 GREEN ROUND (second layer of twist)

1. Attach green yarn to the same place where the red started.
2. Chain 2.
3. In every stitch around, make:
   ✔ 1 FPdc, but place the green stitch in front of the red one
   (Push the red one backward as you work).
4. Work all the way around.
5. Now slip stitch to the first green FPdc.

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🎅 HOW THE TWIST APPEARS

• Because you make two FPdc rounds on the same white base,
• and you push one color in front of the other,
• the stitches naturally spiral and form a candy-cane twist.

No need to alternate colors—you simply stack red FPdc behind green FPdc.

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🧵 PART 3 — FINISHING

1. Fasten off green.
2. Tighten red yarn tail and weave it securely.
3. Flatten your coaster with your hand (or block if needed).

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RESULT

You now have the exact Christmas swirl motif like the picture—
a white center with twisted red + green spiral border.

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