[Need an advice]

After many years of not sewing, I was introduced to quilting, could you please advise me a machine? https://houseandbeyond.org/best-serger-sewing-machine/ I'm torn between Brother and Singer. I want to listen to expert opinion. Thank you.

[How to tell if bobbin is stitching correctly when first starting]

Swiftly pull up on the thread. The thread should unwind just slightly and the bobbin case should drop an inch or two. If the thread unwinds without resistance and the case slips to the floor, your bobbin tension is too loose. If the bobbin case doesn't budge, your bobbin tension is too tight.

[Loopy stitches]

They are caused by incorrect tension settings or a tiny burr on the hook

[magical hexagons]

you can buy used book

[Blueberry Buckle]

Ingredients
FOR THE STREUSEL

It's my fav recipe

1/2 c. unsalted butter, melted
1/3 c. firmly packed light brown sugar 
1/4 c. granulated sugar
1 tsp. ground cinnamon or cardamom
1 1/4 c. all-purpose flour
Pinch of salt
FOR THE BUCKLE
2 1/4 c. all-purpose flour
2 tsp. baking powder
1/2 tsp. salt
3/4 c. granulated sugar
6 tbsp. unsalted butter, softened
2 large eggs
1/2 c. whole milk
2 tsp. lemon zest
2 tsp. vanilla extract
3 c. fresh blueberries, divided
Nonstick cooking spray

 

Directions
Preheat the oven to 375°. 
For the streusel: Stir together the melted butter, brown sugar, granulated sugar, and cinnamon in a medium bowl. Add the flour and salt, stirring until combined. Set aside while making the cake.

For the buckle: Stir together the flour, baking powder, and salt in a medium bowl. Beat the butter and sugar at medium speed using a handheld mixer or stand mixer until creamy in a large bowl. Add eggs, one at a time, beating until just combined after each addition. Gradually add the flour mixture to the butter mixture, alternating with milk, beating until just combined after each addition. Stir in the lemon zest and vanilla, then gently fold in 2 cups of the blueberries.

Spray a 9-by-9-inch baking dish with nonstick cooking spray. Spread the batter evenly in the prepared pan; sprinkle the top of the batter with the remaining 1 cup blueberries. Using your fingers, crumble the streusel mixture and sprinkle it evenly over the berries and batter.
Bake until a tester comes out clean, 40 to 45 minutes. Let cool 20 minutes before slicing.

[Do you do embroidery?]

I do! It was my hobby, I plan to come back to it.