Timeline

\documentclass{standalone}

\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tikz} \usetikzlibrary{calc, arrows.meta, intersections, patterns, positioning, shapes.misc, fadings, through,decorations.pathreplacing}

\definecolor{ColorOne}{named}{MidnightBlue}
\definecolor{ColorTwo}{named}{Dandelion}
\definecolor{ColorThree}{named}{Plum}

\begin{document}

\tikzstyle{descript} = [text = black,align=center, minimum height=1.8cm, align=center, outer sep=0pt,font = \footnotesize]
\tikzstyle{activity} =[align=center,outer sep=1pt]

\begin{tikzpicture}[very thick, black]
\small

%% Coordinates
\coordinate (O) at (-1,0); % Origin
\coordinate (P1) at (4,0);
\coordinate (P2) at (8,0);
\coordinate (P3) at (12,0);
\coordinate (F) at (13,0); %End
\coordinate (E1) at (5,0); %Event
\coordinate (E2) at (0.5,0); %Event

%% Filled regions
\fill[color=ColorOne!20] rectangle (O) -- (P1) -- ($(P1)+(0,1)$) -- ($(O)+(0,1)$); % Studies
\path [pattern color=ColorOne, pattern=north east lines, line width = 1pt, very thick] rectangle ($(O)+(0.5,0)$) -- ($(O)+(2,0)$) -- ($(O)+(2,1)$) -- ($(O)+(0.5,1)$); % Something else
\fill[color=ColorTwo!20] rectangle (P1) -- (P2) -- ($(P2)+(0,1)$) -- ($(P1)+(0,1)$); % Work
\shade[left color=ColorThree, right color=white] rectangle (P2) -- (P3) -- ($(P3)+(0,1)$) -- ($(P2)+(0,1)$); % Current work

%% Text inside filled regions
\draw ($(P1)+(-2.5,0.5)$) node[activity,ColorOne] {Studies};
\draw ($(P2)+(-2,0.5)$) node[activity,ColorTwo] {Work};
\draw ($(P3)+(-2,0.5)$)  node[activity, ColorThree] {Current activity};

%% Description
\node[descript,fill=ColorTwo!15,text=ColorTwo](D2) at ($(P2)+(-2,-2.5)$) {%
	\textbf{Where}\\
	Project\\
	description};

\node[descript,fill=ColorThree!15,text=ColorThree](D3) at ($(P3)+(-2,-2.5)$) {%
	\textbf{Where}\\
	Project\\
	description};
	
%% Events
\draw[<-,thick,color=black] ($(E1)+(0,0.1)$) -- ($(E1)+(0,1.5)$) node [above=0pt,align=center,black] {Unexpected\\event};
\draw [decorate,decoration={brace,amplitude=6pt}]($(E2)+(-1,1.2)$) -- ($(E2)+(0.5,1.2)$) node [black,midway,above=6pt] {Something};

%% Arrows
\path[->,color=ColorTwo] ($(P2)+(-1,-0.1)$) edge [out=-90, in=130]  ($(D2)+(0,1)$);
\path[->,color=ColorThree]($(P3)+(-1,-0.1)$)  edge [out=-70, in=90]  ($(D3)+(0,1)$);

%% Arrow
\draw[->] (O) -- (F);
%% Ticks
\foreach \x in {0,2,...,12}
\draw(\x cm,3pt) -- (\x cm,-3pt);
%% Labels
\foreach \i \j in {0/2013,2/2014,4/2015,6/2016,8/2017,10/2018,12/2019}{
	\draw (\i,0) node[below=3pt] {\j} ;
}

\end{tikzpicture}

\end{document}