I've been doing my own nails for a little over a year now, and by doing so I have saved SO much money! You can check out the sets I've done on my instagram: @zoeycoxformal
This is what I use to attach the gel x extentions to my nails, it's the only one I've tried but I love it!
Beetles Gel Polish 5 in 1 Nail Glue and Base ...
This is an option for gel x tips!
False Nail x Gelly Tips - Best of 2023 Soft Gel & ...
If you're looking for the best of the best, this is what I would reccomend. Do not start out with this kit though!! It is pricey, and I would practice before you spend a lot of money :)