Console Commands I use

If you are fond of testing as I am these commands might be of use to you. To make them work you need to type "sv_cheats 1" into the console first.

•  dota_show_object_obstructions 1 - shows trees on the map grid as green tiles
• dota_show_nav_obstructions 1 - shows objects as obstacles (yellow tiles) and units (blue dots) as well as their changing positions

Both of the commands transform your terrain into Pac-man-like one and is useful to find new juke spots or see the hide spots for instance.

• dota_selection_groups false - to select identical units separately by pressing TAB instead of the whole group (e.g: 4 Centaurs, 100 Spiderlings, 5 Treants). More about it here. Take a look.
•  dota_gridnav_show 1 - shows a navigation grid. Helped me identify the blind spots in the Rosh pit. Read here. 

•  cl_dota_gridnav_show_size 2 - just to make the grid full screen.
• dota_modifier_debug 1 - writes down all events into the console. It's twice as better than combat log because it's more accurate and shows both: server and local timings (as [S] and [C]). It helped me understood that all illusion spawning abilities give more invulnerability time to illusions which leads to interesting consequences. The post about that will be later.

• dota_unit_show_collision_radius 1 - show collision radious of units. It helps midlaners to practice body block and serves as the example that there are exception in collision sizes. For instance, all illusionists and heroes like Lycan, MK has the smallest collision sizes and are able to pass through Tusk's Ice Shard because of that. The separate post about this mechanic will be posted soon.

• dota_unit_draw_paths 1 - draws a line that shows unit's movement commands. In order words when you press right click the game draws 2 lines: the short and the long one. The short is used to bypass obstacles, it is always changing depending on the situation. The long one is used to navigate to farther places and is not changing. It's static but if you get closer to the arrival point it decreses - the short line will take place instead. I made an article about path finding in Dota in Russian and will translate it here soon as well.

Stay tuned.