Grid

Equal-width

1 of 2
2 of 2
1 of 3
2 of 3
3 of 3

Equal-column-width

Column
Column
Column
Column

Setting one column width

1 of 3
2 of 3 (wider)
3 of 3
1 of 3
2 of 3 (wider)
3 of 3

Variable width content

1 of 3
Variable width content
3 of 3
1 of 3
Variable width content
3 of 3

Equal-width multi-row

col
col
col
col

Responsive classes

col
col
col
col
col-8
col-4

Stacked to horizontal

col-sm-8
col-sm-4
col-sm
col-sm
col-sm

Mix and match

.col-12 .col-md-8
.col-6 .col-md-4
.col-6 .col-md-4
.col-6 .col-md-4
.col-6 .col-md-4
.col-6
.col-6

Vertical alignment

One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns
One of three columns

Horizontal alignment

One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns
One of two columns

No gutters

.col-12 .col-sm-6 .col-md-8
.col-6 .col-md-4

Column wrapping

.col-9
.col-4
Since 9 + 4 = 13 > 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
.col-6
Subsequent columns continue along the new line.

Column breaks

.col-6 .col-sm-3
.col-6 .col-sm-3
.col-6 .col-sm-3
.col-6 .col-sm-3
.col-6 .col-sm-4
.col-6 .col-sm-4
.col-6 .col-sm-4
.col-6 .col-sm-4

Reordering Column Order classes

First, but unordered
Second, but last
Third, but first
First, but last
Second, but unordered
Third, but first

Offsetting columns

.col-md-4
.col-md-4 .offset-md-4
.col-md-3 .offset-md-3
.col-md-3 .offset-md-3
.col-md-6 .offset-md-3
.col-sm-5 .col-md-6
.col-sm-5 .offset-sm-2 .col-md-6 .offset-md-0
.col-sm-6 .col-md-5 .col-lg-6
.col-sm-6 .col-md-5 .offset-md-2 .col-lg-6 .offset-lg-0

Margin utilities

.col-md-4
.col-md-4 .ml-auto
.col-md-3 .ml-md-auto
.col-md-3 .ml-md-auto
.col-auto .mr-auto
.col-auto

Nesting

Level 1: .col-sm-9
Level 2: .col-8 .col-sm-6
Level 2: .col-4 .col-sm-6