u/Medical-Break4275

My lashes have been falling out like crazy lately so Ive been looking for a good eyelash serum.
While searching, I saw there are two main types of applicators the straight brush like tip and the curved mascara style tip.
I have no idea how to use the straight one properly. There are tons of reviews but I still cant figure it out. Has anyone tried it?
The curved one seems way easier for beginners like me but some have that little thing on the front. How do you use that part?
If youve tried any eyelash serums please share your experience! Especially if you actually saw good results!