Your Hit Points have a Base and a Current amount for temporary HP boosts. If your HP goes below 0, you enter Death saving throws.
Hit Points
HP
Base
Curr
Your Armour Class determines your defense against attacks. If you are a tanky character, this may indicate your ability to absorb blows. If you are a dextrous character, this may indicate your ability to dodge attacks.
Armour Class
AC
Base
Curr
In grid based combat, speed determines how many grid spaces you may move during your turn.
Speed
Speed
ft
Burn inspiration at any time to give yourself advantage. Advantage means you roll the same dice twice, and take the higher number.
Inspiration
Inspiration
When receiving poison damage, set this counter to that damage amount. Every turn, receive that much damage and reduce the counter by 1.
Poison
Poison
Roll a d20 on your turn. On a 10 or higher, add a success. Below a 10, add a fail. On 3 successes, you remain unconcious and at 0 HP, but you don't have to roll anymore. On 3 fails, you die forever.