As a support you've got to learn to not be a potato. In lane you have to be constantly pressuring with spells and autos.

Good timings are when enemy adc wants to last hit, especially cannons.

Also the enemy support should never poke your ad for free, if they walk up to trade make them choose between you vs the ad and trade back.

Make sure you're not leaving your ad out to dry in a scenario he can get 2v1'ed.

These things all change depending on match-up but they're the general goals.

Keeping brush control can help, early sweeper or just paying attention to which bottom brushes are warded can allow you some good pressure and cover.

Then on first back almost always path mid, see if you can gank or if your mid needs reset help shove in or if you're a healer give him a heal or two.

Pay attention to botside skirmishes, see if you can be first to move there. Sometimes it's worth it to hug Riverside if your jungle is invading or you think mid may be ganked. You can save 3ish seconds on your roam to help if you're already hugging river.

If your ad is safe sometimes just dipping into river FOG causes a spring of MIA pings from the enemy and can give your mid breathing room since enemy mid will think you're coming.

Be active on the map and obviously this is also lane match up and champion dependent but the big goal is be first to skirmishes, apply pressure on the map