A Dota 2 player with the nickname u/Bu3nyy created a detailed map of neutral camp stacking timings in patch 7.38b. The image includes optimal routes for stacking creeps with ranged heroes, including possibilities for double and even triple stacks. The image with all the information was posted on Reddit.

How to Navigate the Map?
The map indicates the timings for stacking neutral camps (from x:52 to x:56), as well as the movement directions for heroes. White arrows show the standard route, while green arrows indicate the path for double stacks. The map also marks the maximum possible number of stacks for each camp:

Red — can be stacked once.
Orange — double stack possible.
Yellow — triple stack available.

According to the map's explanation, each stack reduces the timing by 0.5 seconds, and a double stack can be achieved through auto-attacks. Additionally, a triple stack is possible if there is an ability to aggro the third camp across the river.

Recently, another user with the nickname mglassen conducted their own investigation into the efficiency of Revenant’s Brooch and Daedalus, examining which item deals more damage depending on the situation. The results can be found at the link.