Don't use the ROBLOX editor primarily, instead use the moon animation suite editor (i think thats what it's called).
You should use the ROBLOX editor for a bit, so when you get a feel for animation, you can move to MAS. It has many different easing styles rather than just "Linear," and even more easing styles if you use the "easing sub-plugin." Every animator that wants to make a good animation with flow and allow true life to come into their characters, they should use an advanced animation editor such as MAS, and not a simple one like the ROBLOX editor.
P.S. Inverse Kinematics is coming soon. Kek