Fortnite battle pass what do you get? Extra tasks?

I might want to buy a battle pass and want to know whether it is worth it and what you get apart from the battel pass rewards. Are there any extra tasks? What do you get as rewards? Which lvl should you be there now to achieve lvl 100 and is it worth it? Do you have any tips on lvl? Says everything you need to know about the battle pass.

You don't have to pay for boosters Boosters are when you play with friends you get a level faster or when you do the tasks etc. And Battle Pass stars are something like a bonus, so for the last weekly task you can invest a bonus in which you can doing the final task

And what does this bonus do? Is that the XP bonus? Should you buy the Battle Pass directly or can you buy it later?

And do you know how many V-Bucks you get completely in a battle pass?