Tension is very important, the yarn must be able to glide smoothly from your left hand to the working project, not too tight not too lose.
You will need the following:
Step 1: Start off with a slipknot.
Prepare your yarn tensions on your left hand (right either whichever is your orientation).
Step 2: Chain 12.
Counting from the last loop on the hook (don’t count the loop on the hook).
Step 3: Insert hook into the top loop of the fourth chain.
Step 4: Yarn over and pull up a loop.
Check: Now there are 3 loops on your hook.
Step 5: Yarn over.
Step 6: and pull the yarn through three loops.
You have just made your first half-double crochet
Step 7: Yarn over and insert hook into the top loop of the next chain
Repeat Steps 4 to 7 all the way across your foundation chain.
Starting off the next row
Step 8: To start the next row, chain 3. This will count as your first half-double crochet. Skip the next stitch as it belong to the turning chains.
Step 9: Yarn over, and insert hook into the next stitchStep 10: Yarn over and pull up a loop.
Step 11: Yarn over, and pull the yarn through three loops.
Repeat steps 9 to 11 all the way across to finish the row.
And there you have it. You should have 9 proper half-double crochet and 1 turning chain, a total of 10 stitches for each row.