〜やすい・〜にくい
easy to, hard to
Verb ます-stem + やすい / にくい
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Verb ます-stem + やすい means "easy to do", and + にくい means "hard to do": このペンは書きやすい, "this pen is easy to write with"; この漢字は覚えにくい, "this kanji is hard to remember".
The result is an い-adjective: 書きやすくない, 分かりやすかった.
やすい also means "likely to, prone to", for things that happen by themselves: 雨の日は道が滑りやすい, "roads get slippery on rainy days".
Don't confuse it with 安い ("cheap"), the same sound. And for "difficult" in general, not tied to a verb, it's 難しい; にくい is always about doing something.
Examples
このペンは書きやすいです。
This pen is easy to write with.
先生の説明はいつも分かりやすい。
The teacher's explanations are always easy to follow.
この漢字は覚えにくいです。
This kanji is hard to remember.
雨の日は道が滑りやすい。
Roads get slippery on rainy days.
この靴は歩きにくいです。
These shoes are hard to walk in.