| Attempt | #1 | #2 | #3 | #4 | #5 | #6 | #7 | #8 | #9 | #10 | #11 | #12 |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| Seconds | 301 | 283 | 290 | 286 | 289 | 285 | 287 | 287 | 272 | 276 | 269 | 254 |
Making your example shorter to make easier to understand.
| Attempt | #1    | #2    |
| :---:   | :---: | :---: |
| Seconds | 301   | 283   |
And formatted to make it even easier to read.
| Attempt | #1    | #2    |
| :---:   | :---: | :---: |
| Seconds | 301   | 283   |
Headers must be separated by pipe | characters and underlined by - dash characters. There must be at least three hyphens in each column.
You can create tables by assembling a list of words and dividing them with hyphens - (for the first row), and then separating each column with a pipe |.
First Header  | Second Header
------------- | -------------
Content Cell  | Content Cell
Content Cell  | Content Cell
For aesthetic purposes, you can also add extra pipes on the ends:
| First Header  | Second Header |
| ------------- | ------------- |
| Content Cell  | Content Cell  |
| Content Cell  | Content Cell  |
— GitHub Flavored Markdown
Our example becomes:
| Attempt | #1  | #2  |
| ------- | --- | --- |
| Seconds | 301 | 283 |
Finally, by including colons : within the header row, you can define text to be left-aligned, right-aligned, or center-aligned:
| Left-Aligned  | Center Aligned  | Right Aligned |
| :------------ |:---------------:| -----:|
| col 3 is      | some wordy text | $1600 |
| col 2 is      | centered        |   $12 |
| zebra stripes | are neat        |    $1 |
— GitHub Flavored Markdown
So to center align, our example becomes:
| Attempt | #1    | #2    |
| :-----: | :---: | :---: |
| Seconds | 301   | 283   |