Hello friends! I'm Marta and this is a link that talks about the present perfect simple, is very easy to understand and can help you a lot


https://www.youtube.com/watch?v=l-kOpbSa7HQ


On the other hand, you have another link that talks about the perfect past simple, this time in Spanish, so you do not get confused much


https://www.youtube.com/watch?v=e2Fdf8Vqz3I