The distances of the horizontal lines and the distances of the vertical lines must both be multiples of the sum of the lengths given in the dash-gap list. Otherwise it will look irregular.
Give as many dash and gap lengths. Zero is acceptable. You didn't insert the second gap length, Illustrator sets it as it wants.
An example: dash-gap list 0,5mm/1mm/0,5mm/...
Draw a rectangle the size you want your entire grid.
Select this rectangle and choose Object > Path > Split Into grid from the menu
Enter the number of row and column divisions you want and click OK
Set a stoke
Tick the Rounded Caps Option in the Stroke Panel.
Tick Dashed Stoke option in the Stroke Panel
Enter 0 in the first Dash field
You should make your cover photo the same dimensions that Facebook recommends at 820 W x 312 H pixels. You can export this at 72 dpi.
Your second attempt at saving as 300 dpi is too large, because you uploaded a square image into a rectangle space. The image will fill the space until the image is 820 pixels wide. ...
I'm not sure how accurate and flexible it is, but following method worked for me. But you'll need to experiment depending upon the size of dots you want, length of your spiral and size variation you want. So you might need to try a few times so it gives you the desired results.
You can manually create a brush with specified number of dots and size.
Simply Group things - as in the Illustrator command to Group. - Select all the objects for a single month and choose Object > Group from the menu.
When using the align features, Groups are seen as a single object and will be aligned as such.
So... Group Jan, then group Feb, then Mar, then Apr, etc. You can then choose to align the months, as a whole, to ...
If you mean exact similar pattern, I'd use Object > Transform > Transform Each:
First create a tiny dotted circle using dashed stroke, like this: (this would be inner most part of the pattern)
Then in the Transform window, do settings like this. Basically, you need repeated rotation and scale and copies.
Click copy and press OK. Press Cntrl + D for ...
It is probably because either you have shifted the circle (on which text is typed) a bit down or its size has been affected, by mistake. In other words, both your pink circle and text circle are not concentric. You can see one such example in following GIF, when you move the text circle, it affects the text alignment to the curve.
To avoid this, make sure ...