If you're new to Nostr you need to understand that there is no algorithm.

Your feed is determined by two things:

- Who you follow

- The relays you use - an overlap with the relays of your follows is needed

Therefore:

- A like tells the person that you liked the post

- A zap tells the person that you value the post with money

- A repost tells the person that you valued the post with your reputation

Neither the like nor the zap will impact the feed of the person receiving it or yours.

The repost impacts your feed, obviously.