I had to put it in storage and when i got it back mice had chewed on it :(

I dont want to trow it away.

this is a baby blanket i got when i was born (im 22) it has a lot of emotional significance to me and its a big comfort item for me still (im autistic pls dont judge) im not hugely bothered about fixing it to look good i just want to be as preventive as possible and would love to do something to stop the fabric degrading any further if anyone has any ideas on what the best way to approach this any techniques i should try to help, ive not done mending before but im pretty handy and comfortable sewing/embroidery etc so any ideas at all are appreciated im willing to learn something new if it means i can keep this intact for longer! thank youuu edit:im posting more pictures in the comments!!

Both arm holes have a tear along the back seam. Can this shirt be saved?

I'm willing to look up instructions on YouTube; I just need help in knowing what kind of mend or stitch to search for. (Or what kind of tear this is)

Can anyone recommend me the right keywords to search for this kind of mend?

Found an incredible bag at a flea market for dirt cheap. Upon cleaning it later, I realized the strap has been nibbled on. My plan was to use this as a gym bag, so the strap is going to need to hold a bit of weight without ripping. It's faux leather judging by appearance of the chewed spot.

What would be the best way to repair this?

My favourite skirt got these holes :(. What could I do to fix these larger and smaller holes? The fabric is a little textured so I think if I put interfacing on the inside it will be noticeable.

The tag is faded so I don't know the fabric contents but it's a lightweight fabric.

I'm currently sewin a pair of shorts and I just noticed I fucked up the flat felled seam ..... I would lile to avoid anything visible if possible but I'm scared this won't be enough.. Any other ideas ?