Bugs on dying plant leaves. Bugs?

I noticed today I had a couple of dying yellow leaves. some even had brown spots. When I cut the leaves off I noticed there were black bugs underneath the dead/dying leaves. What is this, and how do I fix? From the pictures I believe they are aphids. Any idea how to get rid of them? How would they originally get there? How do I keep them away?

Thank you

Step 1
Examine your garden regularly for signs of aphids. Look for clusters of the little bugs on new growth and flower buds, as well as on the curled and twisted leaves.
Step 2
Remove the aphids by hand (wearing gloves) or using a sharp stream of water.
Step 3
Cut away and dispose of infested foliage.
Step 4
Capture flying aphids by placing yellow sticky traps near infected plants.
Step 5
Make a nontoxic pesticide by mixing 1 c. vegetable oil with 1 tbsp. liquid dishwashing soap. Add 1 1/2 tsp. solution per cup of warm water to a handheld spray bottle.
Step 6
Hit the aphids directly with above mixture and spray entire plant thoroughly.
Step 7
Introduce beneficial insects, such as ladybugs or green lacewings, to your garden to feed on the aphids. Both can be bought from any garden store or online.

edit: i have never done this myself, this is a general guide against aphids i found online. should get confirmed from more growers that this can be used on cannabis without making problems.

good luck

uless your far into flowering i guess

Step by step baby!

Thank you. great advice that I'll be implementing today.