It depends on what u are flying. There are methods for both gun and missile ships and some work for both, like webs.

For guns: Stick an angular velocity tab to your overview. Make the frigs hunt u and blap them while they are approacking (low angular). Have a clear understanding of your optimal and falloff. Basic modules like Tracking Enhancers and more importantly Tracking Computers, use them wherever u can spare slots. Stay away from target painters. Sure they help but are less useful than Tracking Computers.

Missiles: Target painters (works well with missiles), Rigor rigs, faction or precision T2 missiles and possibly webs. Range is usually a non issue unless u really dont want them to web or Point u.

If u have a large enough drone bay no less than 3 sentry drones will do a fine job if u have enough range. good for when u want to keep blapping bigger ships with your main weapon system.

Large Micro jump drive if u fly a sniper boat will help u deal with frigs.

Dont send drones out to more than 10kms if u want them to live. So if u are prepared to take frigs out with your light drones, w8 until they are in orbit. If there are no elite frigs present, sending lights will be a bit more forgiving.

If u fly a drone/sentry boat u should have no problem. Sentries from range and lights on remaining frigs unless u fit webs and Close range weapons. MJD+Drone scope rigs+omnis+Drone links will help for snipers. More Omni heavy will help brawlers.

Im probably forgetting some ways of dealing with them but I Think I included the more common and best ways.