Pages intended to be reused as portions of other pages are called templates. The names of template pages start with the prefix Template:. A template can be included on another page using the syntax {{Page name}} (including the curly brackets), but leave out the Template: prefix between the curly brackets!
If you wish to make a personal boilerplate (such as a personalized welcome message, or the like), you make it in your own userspace. Simply create the page as a subpage of your userspace (in the format User:Foo/something). To put it onto a page, use the curly brackets as usual, but remember to use the syntax {{User:Foo/something}} rather than {{something}}. This is because the curly-bracket syntax automatically looks in the Template namespace, so if you want to use one from your own userspace, you need to tell it to look there.
To add this auto-updating template to your user page, use{{totd-tomorrow}}
Today's featured picture
The graceful pitta (Erythropitta venusta) is a species of bird in the family Pittidae. It occurs on the Indonesian island of Sumatra, where its natural habitat is subtropical or tropical moist montane forests. The graceful pitta has a length of around 18 cm (7.1 in) in length. It is a predominantly black bird with reddish undertones, the bottom of its wings featuring vivid blue stripes while the lower breast and abdomen are crimson. It has a call which has been described as resembling a high-pitched train whistle which remains at a consistent pitch. The graceful pitta is very rare and is at risk and vulnerable. Although it has been legally protected from hunting since 1931, it is threatened by habitat loss as a result of deforestation. This graceful pitta was photographed in tropical rainforest at Sumatra's Barisan Mountains.