Crthuky

I'm pretty new to Latex and i've just found out about tikZ. I'm barely able to make a triangle and angle. I just wanted to ask if you can tell me how to start with he following project:

The Preamble:

usepackageappendixnumberbeamer

usepackagebooktabs
usepackage[scale=2]ccicons

usepackagepgfplots
usepgfplotslibrarydateplot
usepackagetikz
usetikzlibraryarrows.meta,bending,decorations.markings,intersections,angles,quotes,babe l,lindenmayersystems,plotmarks
pgfdeclarelindenmayersystemA%
 symbolFpgflsystemstep=0.6pgflsystemsteppgflsystemdrawforward
 ruleA->F[+A][-A]

tikzset
 arc arrow/.style args=%
 to pos 1 with length 2
 decoration=
 markings,
 mark=at position 0 with pgfextra%
 pgfmathsetmacrotmpArrowTime2/(pgfdecoratedpathlength)
 xdeftmpArrowTimetmpArrowTime,
 mark=at position 1-tmpArrowTime with coordinate(@1);,
 mark=at position 1-2*tmpArrowTime/3 with coordinate(@2);,
 mark=at position 1-tmpArrowTime/3 with coordinate(@3);,
 mark=at position 1 with coordinate(@4);
 draw[-Stealth[length=2,bend]] 
 (@1) .. controls (@2) and (@3) .. (@4);,
 ,
 postaction=decorate,
 ,bent arrow/.style=arc arrow=to pos #1 with length 2mm,
 pics/strange bar/.style=code=draw[thick] (-#1,0) -- (#1,0);


usepackagexspace
newcommandthemenametextbftextscmetropolisxspace

usepackageamsmath
usepackageamssymb
usepackage[ngerman]babel
usepackage[utf8]inputenc 
usepackage[T1]fontenc 
usepackageanimate
usepackageselinput
SelectInputMappingsadieresis=ä, germandbls=ß

The Frame:

beginframe[fragile]
hspace2cm
begintikzpicture[font=sffamily]
 draw[name path=A] (0,5) coordinate(TL) -- (0,0);
 draw[bent arrow/.list=0.125,0.625] (0,0) circle[x radius=2cm,y radius=0.5cm];
 draw[fill=blue] (-2,0) circle[radius=1.5mm];
 draw[fill=yellow] (0,0) circle[radius=2mm];
 draw[name path=B] (-2,0) -- (1,5) coordinate(TR);
 draw[fill=pink,name intersections=of=A and B,by=I] (I) circle[radius=1.5mm]node[left=3pt]Near star;
 pic [angle radius=1cm,angle eccentricity=.5,draw,"p" alias=p] angle = TR--I--TL;
 draw[pink,latex-,thick] (p) -- ++ (1,-1) node[right,align=left,text=black]parallax angle\ = 1``;
 draw ([xshift=5mm]I) -- ++ (3,0) coordinate (R1) pic[rotate=45]strange bar=0.3
 -- (0,0-|R1) coordinate (R2) pic[rotate=45]strange bar=0.3node[midway,above,sloped] 1 parsec
 -- (2.5,0); 
 draw (-2,-0.3) -- (-2,-2) pic[rotate=45]strange bar=0.3 -- (0,-2)node[midway,above]1 AE pic[rotate=45]strange bar=0.3
 -- (0,-0.3);
 draw[bent arrow/.list=0.125,0.625,thin] (0,5) circle[x radius=1cm,y radius=0.15cm];
 draw[fill=pink] (TR) circle[radius=1mm] (-1,5) circle[radius=1mm];
 draw[pink,latex-,thick,shorten >=1mm] (TR) -- ++ (0.5,-1) node[right,align=left,text=black] (AP) apparent parallax\ motion near star;
 draw[pink,latex-,thick,shorten >=1mm] (-1,5) -- (AP.west);
endtikzpicture
endframe

Welcome to TeX-SE! This is to give you a start. I apologize in advance if I have misinterpreted some elements.

documentclass[tikz,border=3.14mm]standalone
usetikzlibraryarrows.meta,bending,decorations.markings,intersections,angles,quotes
% https://tex.stackexchange.com/a/430239/121799
tikzset% inspired by https://tex.stackexchange.com/a/316050/121799
 arc arrow/.style args=%
 to pos #1 with length #2
 decoration=
 markings,
 mark=at position 0 with pgfextra%
 pgfmathsetmacrotmpArrowTime#2/(pgfdecoratedpathlength)
 xdeftmpArrowTimetmpArrowTime,
 mark=at position #1-tmpArrowTime with coordinate(@1);,
 mark=at position #1-2*tmpArrowTime/3 with coordinate(@2);,
 mark=at position #1-tmpArrowTime/3 with coordinate(@3);,
 mark=at position #1 with coordinate(@4);
 draw[-Stealth[length=#2,bend]] 
 (@1) .. controls (@2) and (@3) .. (@4);,
 ,
 postaction=decorate,
 ,bent arrow/.style=arc arrow=to pos #1 with length 2mm,
 pics/strange bar/.style=code=draw[thick] (-#1,0) -- (#1,0);


begindocument
begintikzpicture[font=sffamily]
 draw[semithick] (80:12) arc(80:100:12) node[midway,above]Distant stars;
 fill foreach X in 82,86,90,92,95,99 (X:12) circle[radius=1.5pt] ;
 draw[name path=A] (0,11.8) coordinate(TL) -- (0,0);
 draw[bent arrow/.list=0.125,0.625] (0,0) circle[x radius=2cm,y radius=0.5cm];
 draw[fill=blue] (-2,0) circle[radius=2mm];
 draw[fill=yellow] (0,0) circle[radius=2mm];
 draw[name path=B] (-2,0) -- (1,11.8) coordinate(TR);
 draw[fill=pink,name intersections=of=A and B,by=I] (I) circle[radius=2mm]
 node[left=3pt]Near star;
 pic [angle radius=1cm,angle eccentricity=1.3,draw,"p" alias=p] angle = TR--I--TL;
 draw[pink,latex-,thick] (p) -- ++ (1,-0.5) node[right,align=left,text=black]parallax angle;
 draw ([xshift=5mm]I) -- ++ (3,0) coordinate (R1) pic[rotate=45]strange bar=0.6
 -- (0,0-|R1) coordinate (R2) pic[rotate=45]strange bar=0.6
 node[midway,above,sloped] 1 parsec
 -- (2.5,0); 
 draw (-2,-0.3) -- (-2,-2) pic[rotate=45]strange bar=0.6 -- (0,-2)
 node[midway,above]1 AU pic[rotate=45]strange bar=0.6
 -- (0,-0.3);
 draw[bent arrow/.list=0.125,0.625,thin] (0,11.8) circle[x radius=1cm,y radius=0.15cm];
 draw[fill=pink] (TR) circle[radius=1mm] (-1,11.8) circle[radius=1mm];
 draw[pink,latex-,thick,shorten >=1mm] (TR) -- ++ (0.5,-1) 
 node[right,align=left,text=black] (AP) apparent parallax\ motion near star;
 draw[pink,latex-,thick,shorten >=1mm] (-1,11.8) -- (AP.west);
endtikzpicture
enddocument