Hello!
In the old layout, the Tree, each skill had a skill name.
Now in the Path, every bubble has a "skill descriptor" instead.
The same skill descriptor can show up multiple times.
Now I will only look at the first time a new skill shows up.
[I was not sure about the first 2 skills, that's why the weird format]
1 Introducing Yourself = Use basic words, introduce yourself (unit 1 )
2 Common Phrases = Use basic words, introduce yourself (unit 1 )
3 The Weather = Describe the weather (unit 2 )
4 Plurals = talk about people (unit 2 )
5 Everyday Life = Describe daily life (unit 3 )
6 Accusative = use the accusative (unit 3 )
7 Possessives = Use possessive pronouns (unit 4 )
8 Languages 1 = talk about languages (unit 4 )
9 Colors = Describe colors (unit 5 )
10 Food 1 = talk about food (unit 5 )
11 Countries and Nationalities = Discuss countries (unit 6 )
12 Animals 1 = talk about animals (unit 6 )
13 Food 2 = Discuss food (unit 7 )
14 Clothing = describe your clothing (unit 7 )
15 Questions = Ask questions (unit 8 )
16 Verbs Present = use the present tense (unit 8 )
17 Family = Talk about your family (unit 9 )
18 Objects = identify everyday objects (unit 9 )
19 Home 1 = Talk about your home (unit 10 )
20 Verbs: Past & Future = use past and future tenses (unit 10 )
21 Numbers = Talk about amounts (unit 11 )
22 Dates = express dates (unit 11 )
23 Occupations = Talk about professions (unit 12 )
24 Imperative and Volitive = use the imperative (unit 12 )
25 Adjectives = Describe objects (unit 13 )
26 Directions = give directions (unit 13 )
27 Affixes 1 = Use affixes (unit 14 )
28 Shopping = make purchases (unit 14 )
29 Time = Talk about time (unit 15 )
30 Home 2 = describe your home (unit 15 )
31 Internet = Talk about the internet (unit 16 )
32 Adverbs = use adverbs (unit 16 )
33 Arts = Talk about art (unit 17 )
34 Feelings = express your feelings (unit 17 )
35 Places = Describe places (unit 18 )
36 People = talk about people (unit 18 )
37 The Body = Talk about your body (unit 19 )
38 Verbs: -ig/-iĝ = use the -ig suffix (unit 19 )
39 Abstract verbs = Talk about abstract actions (unit 20 )
40 Verbs: IĜ = use the -iĝ suffix (unit 20 )
41 Health 1 = Talk about health (unit 21 )
42 Travel = describe your travels (unit 21 )
43 Affixes 2 = Use affixes (unit 22 )
44 Expressions = use expressions (unit 22 )
45 Education = Discuss education (unit 23 )
46 Nature = talk about nature (unit 23 )
47 Sports 1 = Discuss sports (unit 24 )
48 Affixes 3 = use affixes (unit 24 )
49 Ideas = Express your ideas (unit 25 )
50 Languages 2 = talk about languages (unit 25 )
51 Voyages = Describe your travels (unit 26 )
52 Participles 1 = use active participles (unit 26 )
53 Sports 2 = Discuss sports (unit 27 )
54 Communication = talk about communication (unit 27 )
55 Abstract Objects = Discuss abstract ideas (unit 28 )
56 Health 2 = talk about health (unit 28 )
57 Passive Participles = Use passive participles (unit 29 )
58 Events = talk about events (unit 29 )
59 Animals 2 = Describe animals (unit 30 )
60 Business = talk about commerce (unit 30 )
61 Politics = Discuss politics (unit 31 )
62 The World = talk about the earth (unit 31 )
63 Spiritual = Discuss religion (unit 32 )
64 Science = discuss science (unit 32 )
65 Let's Flirt = Talk about romance (unit 33 )
66 Esperanto Culture = discuss Esperanto culture (unit 33 )
67 Financial = Talk about finances (unit 34 )
68 Word Building = expand your vocabulary (unit 34 )
69 Let's Chat = Make small talk (unit 35 )
Units 37-45 are personalized practice only
Esperanto for English speakers, Tree 5, 69 skills, which got transformed into 45 units.
see also a vocab list here: https://liuch.github.io/duolingo_course ... _ver5.html
Amazonia is now becoming a carbon source. 
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