Always remove dead or dying material. Once a leaf begins to turn, take it off. THey are not meant to live forever
Its like combing your hair- the stuff that's already about to fall out - you don't try to save it, comb it out.
I don't know what this plant is.
It looks like a succulent- which is a really broad grouping- only means its a type of plant that has really tight pores so it doesn't dry out when rain is scarce. They have thick meaty "crisp" stems and leaves. They are especially susceptible to over watering. Let the soil dry completely- all the way through before watering again- maximum once every 2 weeks, even in this tiny breathable container.
I have a plant that's commonly known as mother of millions that has a very similar appearance. The color is very different - but I'll tell you why I thought of it and that will help you make a correct ID as you get suggestions. Plant families are very diverse, and the exact same plant can look very different grown in different circumstances- different light, temp, container size and dirt all make HUGE differences. I have a plant that is dark purple all summer long, and when I bring it inside in the winter all new growth is scraggly small light green, but the dimensions and shapes don't change. Here are the important things about your plant- any plant
1. serrated leaf edge, it looks like a saw blade.
2. each leaf is at least 10x times longer than it is wide.
3. Only two leaves at each node, 180 degrees apart. ie all leaves grow in a set of two from the same level as a twin exactly opposite each other. They only grow in pairs of two, on exactly opposite sides of the stalk- not even a little bit staggered- exact opposite start points
4. Each successive node has leaf pairs that are 90 degrees from the last node. SO you have a pair that are exactly right left, the next pair will be exactly front and back, then left right- all the angles are 90 degree square corners all the time.
These are things that don't change. Color, distance between sets of leaves all of that stuff can change- but these 4 characteristics will never change.
Unfortunately there are millions of varieties of plants and they grow bigger or smaller, dense or leggy, even different colors depending on the time of year and the conditions - BUT the ratios don't ever change. As you collect online information this should help you decide what to look for to confirm an ID
