If you mean the difference between 其他 and 别的。 别的is generally used when referring to something in the same 'group', whereas 其他 can refer to things outside that group. So you could say I don't want to drink Green Tea, I want to drink 别的。 So in this case 别的 refers to a different type of tea. If you say 我要其它的。 It could be anything, a coffee, a croissant, it doesn't have to be in that group. The same goes for people 别的人 refers to people you have a connection with. If you went into an office where you didn't know the people, it would be odd to use 别的人 or 别人，if you wanted to know where the other people in the office were, you would use 其他。 We kind of do that in English a bit. So for example, 'where are the others?', it kind of implies a relationship. I think there may be a rule for numbers as in when saying 'another' number. Perhaps you can only say 其他 for digits， but see if a native speaker can confirm that!

他means he/him Like 他是我的弟弟. He is my brother. 我爱他. I love him. 别means don't (do something in a suggesting/warning way) 别打他! Don't hit him! 别说话! Don't speak!

First of all they don't mean "other" when they are used independently. When they combine with other characters into for example, 其他的， 别的, they mean "other". As a native speaker I can't notice any difference between them in a conversation.

I think your question probably about :“其他”and "别的“，cause they means :other in English , am I right?

别 has many meanings in Chinese. It's better to put it in specific words like what you messaged me 別無他求here means (besides the request I asked),I don’t have other requests. When one of meanings of 别 is 另外(另外means besides,other) , as you can see 别&另 have common part and the differences between 别的&其他. The specific words like 别国&他国 as you said. 别国=别的 国家 他国=其他 国家 The differences between 别的&其他 I explained them above. Hope that can help you. Feel free to ask me any questions.