How to use Would

'I would love to travel the world.'

would for unreal situations

The word would is used for unreal or imagined situations:
'I would love to visit New York.'
'She would like to be professional footballer.'
'We would go, but we are too busy.'

would as a past tense

would and wouldn't are the past tense of will and won't. Let's look at an example of this using direct and reported speech:
Andrew: 'I will be late.' (direct speech)
'Andrew said that he would be late.' (reported speech)

would in conditional sentences

Would is used again for unreal or hypothetical situations in the 2nd and 3rd conditionals:
2nd Conditional: 'If I won the lottery, I would travel the world.'
3rd Conditional: 'If I had worked harder, I would have passed the test.'

would not as 'to refuse'

Wouldn't (would not) is used to show that someone refused to do something:

'I asked him if I could borrow his car, but he wouldn't lend it to me.'

would for past actions

Would can be used to talk about actions that repeated in the past. It is used in the same context as used to:
'When I was young I would do my homework every evening.'
'In the summer we would always go camping.'

Link: Using 'wish' for past regrets