How to knit Lace Heart Pattern:
Work with a multiple of 10 stitches + 1 + 2 edge stitches.
Cast on 23 stitches (5 + 10 + 6 + 2 edge stitches) and work according to chart.
The chart shows only Right Side Rows.
On Wrong Side Rows, purl all sts and yarn-over loops.
The patt rep = 10 sts wide.
Horizontally, begin with 1 edge stitch and 5 stitches before patt rep, work patt repeat throughout, end with 6 stitches after patt and 1 edge stitch.
k: Knit
p: Purl
yo: yarn over
k2tog: knit 2 stitches together
skpo: slip 1 stitch as if to knit, knit 1 and pass the slipped stitch over the knitted stitch
cdd (Central Double Decrease): slip first and second stitches together as if to knit, knit 1, pass two slipped stitches over the knit stitch
Row 1 (right side): Knit.
Row 2 and all even-numbered rows (wrong side): Purl.
Row 3: edge st, k1, yo, k3, * cdd, k3, yo, k1, yo, k3 *; repeat from * to *; cdd, k3, yo, k1, edge st.
Row 5: edge st, k2, yo, k2, * cdd, k2, yo, k3, yo, k2 *; repeat from * to *; cdd, k2, yo, k2, edge st.
Row 7: edge st, skpo, yo, k1, yo, k1, * cdd, k1, yo, k1, yo, cdd, yo, k1, yo, k1 *; repeat from * to *; cdd, k1, yo, k1, yo, k2tog, edge st.
Row 9: edge st, k4, yo, * cdd, yo, k7, yo *; repeat from * to *; cdd, yo, k4, edge st.
Row 11: edge st, k1, yo, cdd, yo, k1, * k2, yo, cdd, yo, k1, yo, cdd, yo, k1 *; repeat from * to *; k2, yo, cdd, yo, k1, edge st.
Row 13: Knit.
Row 15: edge st, skpo, k3, yo, * k1, yo, k3, cdd, k3, yo *; repeat from * to *; k1, yo, k3, k2tog, edge st.
Row 17: edge st, skpo, k2, yo, k1, * k2, yo, k2, cdd, k2, yo, k1 *; repeat from * to *; k2, yo, k2, k2tog, edge st.
Row 19: edge st, skpo, k1, yo, k1, yo, * cdd, yo, k1, yo, k1, cdd, k1, yo, k1, yo *; repeat from * to *; cdd, yo, k1, yo, k1, k2tog, edge st.
Row 21: edge st, skpo, yo, k3, * k4, yo, cdd, yo, k3 *; repeat from * to *; k4, yo, k2tog, edge st.
Row 23: edge st, k2, yo, cdd, yo, * k1, yo, cdd, yo, k3, yo, cdd, yo *; repeat from * to *; k1, yo, cdd, yo, k2, edge st.
Vertically, repeat rows 1-24 throughout.
Video: https://youtu.be/BDw4AXnOkpQ