Earthshaker

Consider Fissure blocking the first wave to have better creep equilibrium.

Use Enchant Totem to harass opponents or secure creep last hits, especially ranged ones.

At the end of the laning stage, find a lane for yourself to farm a Blink Dagger and catch up with levels.

Once you get Blink Dagger, try to make use of it immediately before opponent see it in your inventory.

Avoid showing yourself so the opponents forget about you and clump up, and your dagger doesn't get canceled.

In the fights, split the opponents with Fissure into two parts or isolate an opponent from the rest.

If Earthsaker is blocking the first wave with fissure, look to pull back the lane as soon as possible

Earthshaker uses fissure to block off heroes and land kills. Be mindful about your positioning

Keep checking Earthshaker to see if he has Dagger yet. Don't let him surprise you with multi-hero Echo Slam

Once Earthshaker has Blink Dagger or Aghanims Scepter, control him in teamfights before he uses all spells

Earthshaker is likely to have Dagger by now

Don't clump up or Earthshaker might kill you all

Earthshaker might also buy Shadow Blade. If he does, purchase detection