也 is an ancient pictograph whose original subject is debated — possibly a serpent, possibly a water basin. Whatever it once drew, it was borrowed long ago to serve as a grammar word: 'also, too', and in classical Chinese, a marker of emphasis at the end of a sentence.
也 means 'also' and sits right before the verb, not after the subject as in English: 我也是 = 'I am too' (literally 'I-also-am'), 我也好 = 'I'm also fine'. It's one of the highest-frequency function words in Chinese — you'll reach for it constantly to agree and add on.
A hook with a long sweeping stroke — the grammar word for ALSO.
也 goes before the verb, never after the subject like English 'too': 我也喜欢 = 'I also like it'. Master that placement and you sound instantly more natural.