1. It's better if you stay a bit passive and a bit aggressive so you can Farm while harassing the enemy such as Garen for starters. If Getting Harassed by Ranged Champs Such as Teemo you can either Tower Hug
or build Magic Resist, Armour and Health to make sure to stay in lane and farm by tower hugging

2. By Level 6 you can either start to be more Aggressive or just wait for you're jungler to gank top but
being aggressive is much better cause you can kill the Enemy by stacking you're passive on him and the right timing on the ult by looking at the Hp of the enemy

3. Team fights- Its better if you go tanky ad Darius so you can start doing team fights with you're team

4. Targeting the right champs- It's better to analyze the enemy team such as looking where their adc is or
their AP mids if finding one of them its better if you can ping them so you're team can know who to target
or you can just Grab them and the whole team can just target that Adc or AP mid

5. Well I hope this guide helps you in you're game if not then it's not my fault its' just you failing
Take care :D :D :D :D :D