Preheat the grill to medium heat, about 350°F to 400°F
Pat the chicken thighs dry
Trim excess fat if needed
Season with salt, pepper, and your preferred spices or marinade
Oil the grill grates lightly
Place the thighs on the grill skin-side down if using skin-on thighs
Grill over direct heat for 4 to 6 minutes per side to brown
Move to indirect heat if flare-ups occur or if the outside is browning too fast
Close the lid and continue cooking until the internal temperature reaches 165°F
Flip occasionally for even cooking
Brush with barbecue sauce during the last 5 to 10 minutes if desired
Remove from the grill and let rest for 5 minutes before serving