Grid system

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

Equal-width

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

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

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