Learn German: Ich habe vor, täglich zu joggen.

It comes from the separable verb vorhaben, which means to intend or to plan. In the main clause, the verb haben takes the second position, and the prefix vor splits off and goes to the end of that clause, right before the comma.

Why is there a zu before joggen?

This is an infinitive clause. When you state an intention or a plan using verbs like vorhaben (to intend), you add the second action (joggen) using zu plus the infinitive (dictionary form) of the verb.

Why is there a comma in the middle of the sentence?

In German, you use a comma to separate the main clause (Ich habe vor) from an extended infinitive clause (täglich zu joggen). This helps make the sentence structure clearer and easier to read.

If I wanted to add in the park to this sentence, where would it go?

It would go inside the infinitive clause, before the zu part: Ich habe vor, täglich im Park zu joggen. The phrase with zu and the infinitive verb must always sit at the very end of the sentence.