I suppose that the easiest and a very simple way to learn and memorize Chinese characters is to learn Chinese radicals and Chinese character decomposition!
Decomposition of the Chinese character 火 huǒ ‘fire’:
丷 bā eight
人 rén man
丷人
Which decomposition option of the Chinese character 天 tiān ‘sky’ is correct?
1. 二 èr two, 人 rén man
2. 一 yī one, 大 dà big
3. 一 yī one, 大 dà big, 一 yī one, 人 rén man
4. 一 yī one, 一 yī one, 大 dà big, 一 yī one, 人 rén man
5. All options are correct