“~hō ga ii desu” means “It’s better to do something”. For instance, “Kusuri o nonda hō ga ii desu” means “It’s better to take medicine”. Remember that the verb must be converted to past tense when using this sentences. As shown in the above example, “Nomu” (Drink) is converted to “Nonda” which is past tense. However, when using this sentence for negative phrase, no past tense shall be used. For example : “Kusuri wa nomanai hō ga ii desu” (It’s better not to take medicine). See it doesn’t use “nomanakatta” (past tense) instead “nomanai” (present tense) is used.

As usual, “o” shall be used after the noun for positive phrase and “wa” is used for negative phrase.

Other Examples
It’s better to eat more vegetables - Yasai o takusan (taberu)tabeta hō ga ii desu
It’s better to sleep earlier - (Hayai)Hayaku (neru)neta hō ga ii desu
It’s better not to go too far - Amari (tooi)tooku e wa (iku)ikanai hō ga ii desu
Meaning : Yasai (Vegetables), Takusan (Many / More), Neru (Sleep), Hayai (Fast), Tooi (Far), Amari (Not So)