>>2952031
did you use a water based stain? did you water pop it before or after? if your stain was water based, it's likely that the grain were raised and you needed to sand off the fuzz first before varnish. Given this is your first coat, what you are seeing is a combination of raised grain/standing fuzz as well as just general bubbles and dust. For the first 2-3 coats, sand with a higher grit sandpaper (320/400) after varnish dries and it'll get rid of those. For your final coat, you usually have a smooth enough surface that you don't want to sand after. You wax after.