There are so many ways to weave in your ends, so you might find your own way, which is totally fine! If you would like guidance, below are two methods that I recommend.
The duplicate stitch method is a great way to weave in your ends for a project with stockinette stitch. Stockinette stitch is created by knitting in the round or alternating K1, P1 when knitting with straight needles. The duplicate stitch method is a great way to weave in ends for the Smoke & Slate Super Chunk Hat Knit Kit.
the duplicate stitch method is simply weaving your edge along the path of your stitches. See below photos for guidance. I used a contrast color as my end so that you can easily see how it is woven.
Using an tapestry needle (if you have one) or just your hands, bring your needle from the back to the front of your work through the bottom of the nearest "V". Bring the needle behind the "V" above.
Bring your end through the "V" above and back through the base of the first "V" where you began.
Now repeat on the stitch to the right, left, or above (i.e. if you're weaving in the edge for ribbing on The Super Chunk Hat)
Continue for a few stitches and then cut your edge. Yours will blend in as you won't be using a contrast color yarn!
Garter Stitch is created knitting in the round by knitting one row, which creates bumps, then purling one row, which creates a flat "V". This is the stitch used in the Super Chunk Cowl Knit Kit.
On the purl rows, there are alternating "top bumps", which look like an upside down smiley face, and "bottom bumps", which look like a right side up smiley face.
There are many ways to weave in your ends, but I like to weave my ends along a row of purl bumps by going up through a "top bump" and down through a "bottom bump". See below images! Note, I used a contrast color as my end so that you can easily see how it is woven.
To begin, bring your end from the back of your work to the front using your fingers or a tapestry needle, if available. Bring your end up through a "top bump".
Then, bring your needle down through the "bottom bump" to the right or left.
Repeat through a few bumps!
Once you are done, cut your end!