Filter for Blogposts without Plugin

Hey there, at the moment im working on the blogpage of my new website https://hechtinsgefecht.de/blog/ and wondered if there is a possibility to create a blog filter like this im using right now but without a plugin. At the moment im using content views but honestly its a bit bloated to me and i solely want a simple filter by custom field or tag without hopping to another page (ajax i guess). Why im asking this? At the moment i rely on css to style the blogpost results and i wanted to use generateblocks for this. So maybe there is a simple way to hook a filter into a page with blogposts or a blog category to do this.