i want to know the use of would . is it used for future? like what would he react? why would he trust me. i m not getting that when do we use will and when do we use would

i want to know the use of would . is it used for future? like what would he react? why would he trust me. i m not getting that when do we use will and when do we use would

There are many video lesson on YouTube, you should get their help. I think evidharty English lessons are very useful for you. Available on YouTube